diff --git a/src/algorithms/tracking/adapters/galileo_e1_dll_pll_veml_tracking.cc b/src/algorithms/tracking/adapters/galileo_e1_dll_pll_veml_tracking.cc
index b965386eb..06ef6e920 100755
--- a/src/algorithms/tracking/adapters/galileo_e1_dll_pll_veml_tracking.cc
+++ b/src/algorithms/tracking/adapters/galileo_e1_dll_pll_veml_tracking.cc
@@ -64,7 +64,7 @@ GalileoE1DllPllVemlTracking::GalileoE1DllPllVemlTracking(
     float early_late_space_chips;
     float very_early_late_space_chips;
 
-    item_type = configuration->property(role + ".item_type",default_item_type);
+    item_type = configuration->property(role + ".item_type", default_item_type);
     fs_in = configuration->property("GNSS-SDR.internal_fs_hz", 2048000);
     f_if = configuration->property(role + ".if", 0);
     dump = configuration->property(role + ".dump", false);
@@ -96,9 +96,13 @@ GalileoE1DllPllVemlTracking::GalileoE1DllPllVemlTracking(
         }
     else
         {
+            item_size_ = sizeof(gr_complex);
             LOG(WARNING) << item_type << " unknown tracking item type.";
         }
 
+    channel_ = 0;
+    channel_internal_queue_ = 0;
+
     DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
 }
 
diff --git a/src/algorithms/tracking/adapters/galileo_e1_tcp_connector_tracking.cc b/src/algorithms/tracking/adapters/galileo_e1_tcp_connector_tracking.cc
index fc9361c89..ed2e30a35 100644
--- a/src/algorithms/tracking/adapters/galileo_e1_tcp_connector_tracking.cc
+++ b/src/algorithms/tracking/adapters/galileo_e1_tcp_connector_tracking.cc
@@ -97,9 +97,11 @@ GalileoE1TcpConnectorTracking::GalileoE1TcpConnectorTracking(
         }
     else
         {
+            item_size_ = sizeof(gr_complex);
             LOG(WARNING) << item_type << " unknown tracking item type.";
         }
-
+    channel_ = 0;
+    channel_internal_queue_ = 0;
     DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
 }
 
diff --git a/src/algorithms/tracking/adapters/galileo_e5a_dll_pll_tracking.cc b/src/algorithms/tracking/adapters/galileo_e5a_dll_pll_tracking.cc
index a094521b1..4e67b117a 100644
--- a/src/algorithms/tracking/adapters/galileo_e5a_dll_pll_tracking.cc
+++ b/src/algorithms/tracking/adapters/galileo_e5a_dll_pll_tracking.cc
@@ -103,8 +103,11 @@ GalileoE5aDllPllTracking::GalileoE5aDllPllTracking(
         }
     else
         {
+            item_size_ = sizeof(gr_complex);
             LOG(WARNING) << item_type << " unknown tracking item type.";
         }
+    channel_ = 0;
+    channel_internal_queue_ = 0;
     DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
 }
 
diff --git a/src/algorithms/tracking/adapters/galileo_volk_e1_dll_pll_veml_tracking.cc b/src/algorithms/tracking/adapters/galileo_volk_e1_dll_pll_veml_tracking.cc
index 48794165a..cb19c377a 100644
--- a/src/algorithms/tracking/adapters/galileo_volk_e1_dll_pll_veml_tracking.cc
+++ b/src/algorithms/tracking/adapters/galileo_volk_e1_dll_pll_veml_tracking.cc
@@ -96,9 +96,13 @@ GalileoVolkE1DllPllVemlTracking::GalileoVolkE1DllPllVemlTracking(
         }
     else
         {
+            item_size_ = sizeof(gr_complex);
             LOG(WARNING) << item_type << " unknown tracking item type.";
         }
 
+    channel_ = 0;
+    channel_internal_queue_ = 0;
+
     DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
 }
 
diff --git a/src/algorithms/tracking/adapters/gps_l1_ca_dll_fll_pll_tracking.cc b/src/algorithms/tracking/adapters/gps_l1_ca_dll_fll_pll_tracking.cc
index 0f7ff61f6..265b3eedb 100644
--- a/src/algorithms/tracking/adapters/gps_l1_ca_dll_fll_pll_tracking.cc
+++ b/src/algorithms/tracking/adapters/gps_l1_ca_dll_fll_pll_tracking.cc
@@ -102,8 +102,11 @@ GpsL1CaDllFllPllTracking::GpsL1CaDllFllPllTracking(
         }
     else
         {
+            item_size_ = sizeof(gr_complex);
             LOG(WARNING) << item_type << " unknown tracking item type.";
         }
+    channel_ = 0;
+    channel_internal_queue_ = 0;
 
     DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
 }
diff --git a/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_optim_tracking.cc b/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_optim_tracking.cc
index ad46b5b34..11392d87b 100644
--- a/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_optim_tracking.cc
+++ b/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_optim_tracking.cc
@@ -93,8 +93,12 @@ GpsL1CaDllPllOptimTracking::GpsL1CaDllPllOptimTracking(
         }
     else
         {
+            item_size_ = sizeof(gr_complex);
             LOG(WARNING) << item_type << " unknown tracking item type.";
         }
+
+    channel_ = 0;
+    channel_internal_queue_ = 0;
     DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
 }
 
diff --git a/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_tracking.cc b/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_tracking.cc
index 0613e9ad8..4dcab03c7 100644
--- a/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_tracking.cc
+++ b/src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_tracking.cc
@@ -93,8 +93,11 @@ GpsL1CaDllPllTracking::GpsL1CaDllPllTracking(
         }
     else
         {
+            item_size_ = sizeof(gr_complex);
             LOG(WARNING) << item_type << " unknown tracking item type.";
         }
+    channel_ = 0;
+    channel_internal_queue_ = 0;
     DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
 }
 
diff --git a/src/algorithms/tracking/adapters/gps_l1_ca_tcp_connector_tracking.cc b/src/algorithms/tracking/adapters/gps_l1_ca_tcp_connector_tracking.cc
index 2da95a636..f21e73b94 100644
--- a/src/algorithms/tracking/adapters/gps_l1_ca_tcp_connector_tracking.cc
+++ b/src/algorithms/tracking/adapters/gps_l1_ca_tcp_connector_tracking.cc
@@ -94,8 +94,12 @@ GpsL1CaTcpConnectorTracking::GpsL1CaTcpConnectorTracking(
         }
     else
         {
+            item_size_ = sizeof(gr_complex);
             LOG(WARNING) << item_type << " unknown tracking item type.";
         }
+
+    channel_ = 0;
+    channel_internal_queue_ = 0;
     DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
 }
 
diff --git a/src/algorithms/tracking/adapters/gps_l2_m_dll_pll_tracking.cc b/src/algorithms/tracking/adapters/gps_l2_m_dll_pll_tracking.cc
index 25fef9f76..0c4745a77 100644
--- a/src/algorithms/tracking/adapters/gps_l2_m_dll_pll_tracking.cc
+++ b/src/algorithms/tracking/adapters/gps_l2_m_dll_pll_tracking.cc
@@ -91,8 +91,11 @@ GpsL2MDllPllTracking::GpsL2MDllPllTracking(
         }
     else
         {
+            item_size_ = sizeof(gr_complex);
             LOG(WARNING) << item_type << " unknown tracking item type.";
         }
+    channel_ = 0;
+    channel_internal_queue_ = 0;
     DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
 }
 
diff --git a/src/algorithms/tracking/gnuradio_blocks/galileo_e1_dll_pll_veml_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/galileo_e1_dll_pll_veml_tracking_cc.cc
index 3e7e1427c..0ea92589c 100755
--- a/src/algorithms/tracking/gnuradio_blocks/galileo_e1_dll_pll_veml_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/galileo_e1_dll_pll_veml_tracking_cc.cc
@@ -174,6 +174,15 @@ galileo_e1_dll_pll_veml_tracking_cc::galileo_e1_dll_pll_veml_tracking_cc(
     *d_Prompt = gr_complex(0,0);
     *d_Late = gr_complex(0,0);
     *d_Very_Late = gr_complex(0,0);
+
+    d_channel_internal_queue = 0;
+    d_acquisition_gnss_synchro = 0;
+    d_channel = 0;
+    d_acq_code_phase_samples = 0.0;
+    d_acq_carrier_doppler_hz = 0.0;
+    d_carrier_doppler_hz = 0.0;
+    d_acc_carrier_phase_rad = 0.0;
+    d_acc_code_phase_secs = 0.0;
 }
 
 void galileo_e1_dll_pll_veml_tracking_cc::start_tracking()
diff --git a/src/algorithms/tracking/gnuradio_blocks/galileo_e1_tcp_connector_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/galileo_e1_tcp_connector_tracking_cc.cc
index 4a657383e..bdbd5f363 100644
--- a/src/algorithms/tracking/gnuradio_blocks/galileo_e1_tcp_connector_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/galileo_e1_tcp_connector_tracking_cc.cc
@@ -170,6 +170,17 @@ Galileo_E1_Tcp_Connector_Tracking_cc::Galileo_E1_Tcp_Connector_Tracking_cc(
     d_carrier_lock_fail_counter = 0;
     d_carrier_lock_threshold = CARRIER_LOCK_THRESHOLD;
     systemName["E"] = std::string("Galileo");
+
+    d_channel_internal_queue = 0;
+    d_acquisition_gnss_synchro = 0;
+    d_channel = 0;
+    d_next_rem_code_phase_samples = 0;
+    d_acq_code_phase_samples = 0.0;
+    d_acq_carrier_doppler_hz = 0.0;
+    d_acc_carrier_phase_rad = 0.0;
+    d_acc_code_phase_secs = 0.0;
+    d_code_phase_samples = 0;
+    d_next_prn_length_samples = 0;
 }
 
 
diff --git a/src/algorithms/tracking/gnuradio_blocks/galileo_volk_e1_dll_pll_veml_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/galileo_volk_e1_dll_pll_veml_tracking_cc.cc
index 76cdba570..d9ae8bd9c 100644
--- a/src/algorithms/tracking/gnuradio_blocks/galileo_volk_e1_dll_pll_veml_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/galileo_volk_e1_dll_pll_veml_tracking_cc.cc
@@ -191,6 +191,15 @@ gr::block("galileo_volk_e1_dll_pll_veml_tracking_cc", gr::io_signature::make(1,
     *d_Prompt = gr_complex(0,0);
     *d_Late = gr_complex(0,0);
     *d_Very_Late = gr_complex(0,0);
+
+    d_channel_internal_queue = 0;
+    d_acquisition_gnss_synchro = 0;
+    d_channel = 0;
+    d_acq_code_phase_samples = 0.0;
+    d_acq_carrier_doppler_hz = 0.0;
+    d_carrier_doppler_hz = 0.0;
+    d_acc_carrier_phase_rad = 0.0;
+    d_acc_code_phase_secs = 0.0;
 }
 
 void galileo_volk_e1_dll_pll_veml_tracking_cc::start_tracking()
@@ -356,7 +365,7 @@ int galileo_volk_e1_dll_pll_veml_tracking_cc::general_work (int noutput_items,gr
         }
         
         // GNSS_SYNCHRO OBJECT to interchange data between tracking->telemetry_decoder
-        Gnss_Synchro current_synchro_data;
+        Gnss_Synchro current_synchro_data = Gnss_Synchro();
         // Fill the acquisition data
         current_synchro_data = *d_acquisition_gnss_synchro;
         
diff --git a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_fll_pll_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_fll_pll_tracking_cc.cc
index 3e71b3961..14697ec1e 100644
--- a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_fll_pll_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_fll_pll_tracking_cc.cc
@@ -158,6 +158,21 @@ Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc(
     systemName["S"] = std::string("SBAS");
     systemName["E"] = std::string("Galileo");
     systemName["C"] = std::string("Compass");
+
+    d_channel_internal_queue = 0;
+    //d_acquisition_gnss_synchro = 0;
+    d_channel = 0;
+    d_acq_carrier_doppler_hz = 0.0;
+    d_code_freq_hz = 0.0;
+    d_rem_carr_phase = 0.0;
+    d_rem_code_phase_samples = 0.0;
+    d_acq_code_phase_samples = 0;
+    d_acq_carrier_doppler_hz = 0.0;
+    d_acc_carrier_phase_rad = 0.0;
+    d_acc_code_phase_samples = 0;
+    d_FLL_discriminator_hz = 0.0;
+    d_pull_in = false;
+    d_FLL_wait = 1;
 }
 
 
diff --git a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_optim_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_optim_tracking_cc.cc
index 92ce75645..86886dcee 100644
--- a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_optim_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_optim_tracking_cc.cc
@@ -162,6 +162,16 @@ Gps_L1_Ca_Dll_Pll_Optim_Tracking_cc::Gps_L1_Ca_Dll_Pll_Optim_Tracking_cc(
     d_carrier_lock_threshold = CARRIER_LOCK_THRESHOLD;
 
     systemName["G"] = std::string("GPS");
+
+    d_channel_internal_queue = 0;
+    d_acquisition_gnss_synchro = 0;
+    d_channel = 0;
+    d_acq_code_phase_samples = 0.0;
+    d_acq_carrier_doppler_hz = 0.0;
+    d_carrier_doppler_hz = 0.0;
+    d_acc_carrier_phase_rad = 0.0;
+    d_code_phase_samples = 0.0;
+    d_acc_code_phase_secs = 0.0;
 }
 
 
diff --git a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc
index db1abad7f..85d63f54c 100644
--- a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_cc.cc
@@ -167,6 +167,15 @@ Gps_L1_Ca_Dll_Pll_Tracking_cc::Gps_L1_Ca_Dll_Pll_Tracking_cc(
 
     set_relative_rate(1.0/((double)d_vector_length*2));
 
+    d_channel_internal_queue = 0;
+    d_acquisition_gnss_synchro = 0;
+    d_channel = 0;
+    d_acq_code_phase_samples = 0.0;
+    d_acq_carrier_doppler_hz = 0.0;
+    d_carrier_doppler_hz = 0.0;
+    d_acc_carrier_phase_rad = 0.0;
+    d_code_phase_samples = 0.0;
+    d_acc_code_phase_secs = 0.0;
     //set_min_output_buffer((long int)300);
 }
 
@@ -337,7 +346,7 @@ int Gps_L1_Ca_Dll_Pll_Tracking_cc::general_work (int noutput_items, gr_vector_in
     Gnss_Synchro **out = (Gnss_Synchro **) &output_items[0];
 
     // GNSS_SYNCHRO OBJECT to interchange data between tracking->telemetry_decoder
-    Gnss_Synchro current_synchro_data;
+    Gnss_Synchro current_synchro_data = Gnss_Synchro();
 
 
     if (d_enable_tracking == true)
diff --git a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_tcp_connector_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_tcp_connector_tracking_cc.cc
index 2351db65d..671b3ddc1 100644
--- a/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_tcp_connector_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_tcp_connector_tracking_cc.cc
@@ -174,6 +174,17 @@ Gps_L1_Ca_Tcp_Connector_Tracking_cc::Gps_L1_Ca_Tcp_Connector_Tracking_cc(
     systemName["S"] = std::string("SBAS");
     systemName["E"] = std::string("Galileo");
     systemName["C"] = std::string("Compass");
+
+    d_channel_internal_queue = 0;
+    d_acquisition_gnss_synchro = 0;
+    d_channel = 0;
+    d_next_rem_code_phase_samples = 0;
+    d_acq_code_phase_samples = 0.0;
+    d_acq_carrier_doppler_hz = 0.0;
+    d_carrier_doppler_hz = 0.0;
+    d_acc_carrier_phase_rad = 0.0;
+    d_code_phase_samples = 0;
+    d_next_prn_length_samples = 0;
 }
 
 void Gps_L1_Ca_Tcp_Connector_Tracking_cc::start_tracking()
diff --git a/src/algorithms/tracking/gnuradio_blocks/gps_l2_m_dll_pll_tracking_cc.cc b/src/algorithms/tracking/gnuradio_blocks/gps_l2_m_dll_pll_tracking_cc.cc
index 3137325b0..a7fa6cfef 100644
--- a/src/algorithms/tracking/gnuradio_blocks/gps_l2_m_dll_pll_tracking_cc.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/gps_l2_m_dll_pll_tracking_cc.cc
@@ -169,7 +169,17 @@ gps_l2_m_dll_pll_tracking_cc::gps_l2_m_dll_pll_tracking_cc(
     set_relative_rate(1.0/((double)d_vector_length*2));
     //set_min_output_buffer((long int)300);
 
-    LOG(INFO)<<"d_vector_length"<<d_vector_length<<std::endl;
+    d_channel_internal_queue = 0;
+    d_acquisition_gnss_synchro = 0;
+    d_channel = 0;
+    d_acq_code_phase_samples = 0.0;
+    d_acq_carrier_doppler_hz = 0.0;
+    d_carrier_doppler_hz = 0.0;
+    d_acc_carrier_phase_rad = 0.0;
+    d_code_phase_samples = 0.0;
+    d_acc_code_phase_secs = 0.0;
+
+    LOG(INFO) << "d_vector_length" << d_vector_length;
 }
 
 
@@ -333,7 +343,7 @@ int gps_l2_m_dll_pll_tracking_cc::general_work (int noutput_items, gr_vector_int
     float code_error_filt_chips;
 
     // GNSS_SYNCHRO OBJECT to interchange data between tracking->telemetry_decoder
-    Gnss_Synchro current_synchro_data;
+    Gnss_Synchro current_synchro_data = Gnss_Synchro();
 
     // Block input data and block output stream pointers
     const gr_complex* in = (gr_complex*) input_items[0]; //PRN start block alignment