--- bird-1.0.11/obj/lib/krt.c.orig	2005-07-05 14:48:28.000000000 +0800
+++ bird-1.0.11/obj/lib/krt.c	2005-07-05 14:49:23.000000000 +0800
@@ -770,7 +770,11 @@
   if (first)
     krt_scan_timer = krt_start_timer(p);
   else
-    tm_start(p->scan_timer, 0);
+  {
+    if (p->scan_timer) {
+      tm_start(p->scan_timer, 0);
+    }
+  }
   p->scan_timer = krt_scan_timer;
 #else
   p->scan_timer = krt_start_timer(p);