--- res/res_agi.c.orig	2010-01-04 13:30:44.000000000 -0500
+++ res/res_agi.c	2010-02-22 13:56:41.000000000 -0500
@@ -1999,6 +1999,7 @@
 				reason = "hangup";
 			}
 			ast_frfree(fr);
+			fr = NULL;
 		}
 	}