Index: main/pbx.c
===================================================================
--- main/pbx.c	(revision 241162)
+++ main/pbx.c	(working copy)
@@ -3650,7 +3650,7 @@
 	struct ast_app *app;
 	int res;
 	struct pbx_find_info q = { .stacklen = 0 }; /* the rest is reset in pbx_find_extension */
-	char passdata[EXT_DATA_SIZE];
+	char passdata[EXT_DATA_SIZE] = "";
 
 	int matching_action = (action == E_MATCH || action == E_CANMATCH || action == E_MATCHMORE);