diff -NaurbB old/pbx.c new/pbx.c
--- old/pbx.c	2009-01-29 13:29:19.000000000 +0000
+++ new/pbx.c	2009-01-29 12:51:33.000000000 +0000
@@ -1515,6 +1515,9 @@
 						*s2++ = s3;
 					}
 					s1++; s1++;
+				} else if (*s1 == 0) {
+					ast_log(LOG_WARNING,"A matching ']' was not found for '[' in pattern string\n");
+					break;
 				} else {
 					*s2++ = *s1++;
 				}