diff --git a/src/core/receiver/gnss_flowgraph.cc b/src/core/receiver/gnss_flowgraph.cc
index c34041f72..990780e3d 100644
--- a/src/core/receiver/gnss_flowgraph.cc
+++ b/src/core/receiver/gnss_flowgraph.cc
@@ -118,6 +118,14 @@ void GNSSFlowgraph::init()
     int sources_count_deprecated = configuration_->property("Receiver.sources_count", 1);
     sources_count_ = configuration_->property("GNSS-SDR.num_sources", sources_count_deprecated);
 
+    // Avoid segmentation fault caused by wrong configuration
+    if (sources_count_ == 2 && block_factory->GetSignalSource(configuration_.get(), queue_.get(), 0)->implementation() == "Multichannel_File_Signal_Source")
+        {
+            std::cout << " * Please set GNSS-SDR.num_sources=1 in your configuraiion file\n";
+            std::cout << "   if you are using the Multichannel_File_Signal_Source implementation.\n";
+            sources_count_ = 1;
+        }
+
     int signal_conditioner_ID = 0;
 
     for (int i = 0; i < sources_count_; i++)