Index: apps/app_stack.c
===================================================================
--- apps/app_stack.c	(revision 412224)
+++ apps/app_stack.c	(working copy)
@@ -734,6 +734,7 @@
 		if (!ast_true(args.suppress)) {
 			ast_log(LOG_ERROR, "Stack peek of '%s' is more stack frames than I have\n", args.n);
 		}
+		AST_LIST_UNLOCK(oldlist);
 		ast_channel_unlock(chan);
 		return -1;
 	}