FSCORE-300

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@12062 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_core_io.c

@@ -800,7 +800,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_write_frame(switch_core_sess
 	}
 
 	if (session->write_codec) {
-		if (!ptime_mismatch && 
+		if (!ptime_mismatch && write_frame->codec && write_frame->codec->implementation &&
 			write_frame->codec->implementation->decoded_bytes_per_packet == session->write_impl.decoded_bytes_per_packet) {
 			perfect = TRUE;
 		}