Index: prisched.c
===================================================================
--- prisched.c	(revision 1505)
+++ prisched.c	(working copy)
@@ -125,5 +125,6 @@
 		pri = pri->master;
 	if ((id >= MAX_SCHED) || (id < 0)) 
 		pri_error(pri, "Asked to delete sched id %d???\n", id);
-	pri->pri_sched[id].callback = NULL;
+	else
+		pri->pri_sched[id].callback = NULL;
 }