Fix crash on exit when FGCom is not being used.

diff --git a/src/Network/fgcom.cxx b/src/Network/fgcom.cxx
index 5d9319c2053139b9eaf2d7a94354ec2858200205..4f4853af4140ee9a152c88d9ac3c734eea3d5207 100644 (file)
--- a/src/Network/fgcom.cxx
+++ b/src/Network/fgcom.cxx
@@ -330,6 +330,10 @@ void FGCom::update(double dt)
 
 void FGCom::shutdown()
 {
+    if( !_enabled ) {
+        return;
+    }
+    
   SG_LOG( SG_IO, SG_INFO, "FGCom shutdown()" );
   _enabled = false;