From a2eaf403fffea1150d5a486929023a7d4752166b Mon Sep 17 00:00:00 2001
From: Antonio Ramos <antonio.ramosdet@gmail.com>
Date: Wed, 21 Feb 2018 13:12:45 +0100
Subject: [PATCH] Avoid acces to a out of range value

---
 .../gnuradio_blocks/hybrid_observables_cc.cc  | 33 ++++++++++++-------
 1 file changed, 21 insertions(+), 12 deletions(-)

diff --git a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
index 92a308356..19b0e89ba 100644
--- a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
+++ b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
@@ -369,21 +369,30 @@ std::pair<Gnss_Synchro, Gnss_Synchro> hybrid_observables_cc::find_closest(std::d
         }
         aux++;
     }
-    delta_t = T_rx_s - data.at(index).RX_time;
-    if((index == (data.size() - 1)) or (delta_t < 0.0))
+    try
     {
-        result.first = data.at(index);
-        result.second = data.at(index - 1);
+        delta_t = T_rx_s - data.at(index).RX_time;
+        if(index == 0)
+        {
+            result.first = data.at(1);
+            result.second = data.at(0);
+        }
+        else if((index == (data.size() - 1)) or (delta_t < 0.0))
+        {
+            result.first = data.at(index);
+            result.second = data.at(index - 1);
+        }
+        else
+        {
+            result.first = data.at(index + 1);
+            result.second = data.at(index);
+        }
     }
-    else if(index == 0)
+    catch(const std::exception& e)
     {
-        result.first = data.at(1);
-        result.second = data.at(0);
-    }
-    else
-    {
-        result.first = data.at(index + 1);
-        result.second = data.at(index);
+        result.first = Gnss_Synchro();
+        result.second = Gnss_Synchro();
+        LOG(WARNING) << e.what();
     }
     return result;
 }