Index: main/lock.c
===================================================================
--- main/lock.c	(revision 386686)
+++ main/lock.c	(working copy)
@@ -745,7 +745,7 @@
 		__ast_mutex_logger("%s line %d (%s): Error destroying rwlock %s: %s\n",
 				filename, lineno, func, rwlock_name, strerror(res));
 	}
-	if (t->tracking) {
+	if (t->tracking && lt) {
 		ast_reentrancy_lock(lt);
 		lt->file[0] = filename;
 		lt->lineno[0] = lineno;