Index: trunk/BNC/bncrinex.cpp
===================================================================
--- trunk/BNC/bncrinex.cpp	(revision 390)
+++ trunk/BNC/bncrinex.cpp	(revision 391)
@@ -210,5 +210,5 @@
   expandEnvVar(path);
 
-  if ( path[path.length()-1] != QDir::separator() ) {
+  if ( path.length() > 0 && path[path.length()-1] != QDir::separator() ) {
     path += QDir::separator();
   }