--- old/asterisk-1.6.1.1/main/pbx.c	Fri Apr 17 10:33:27 2009
+++ asterisk-1.6.1.1/main/pbx.c	Thu Jun 25 16:31:23 2009
@@ -3143,6 +3143,9 @@
 
 	int matching_action = (action == E_MATCH || action == E_CANMATCH || action == E_MATCHMORE);
 
+
+        context = context ? context : ""; /* Context should not be NULL */
+
 	ast_rdlock_contexts();
 	if (found)
 		*found = 0;