1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/proc/sched.c b/kernel/proc/sched.c
index c8f209c..91264fa 100644
--- a/kernel/proc/sched.c
+++ b/kernel/proc/sched.c
@@ -333,8 +333,12 @@ void sched_wakeup_on(ktqueue_t *q, kthread_t **ktp)
 {
     // NOT_YET_IMPLEMENTED("PROCS: sched_wakeup_on");
 
-    if (sched_queue_empty(q))
+    if (sched_queue_empty(q) || q == NULL)
     {
+        if (ktp)
+        {
+            *ktp = NULL;
+        }
         return;
     }
 
@@ -344,6 +348,7 @@ void sched_wakeup_on(ktqueue_t *q, kthread_t **ktp)
     {
         *ktp = thr;
     }
+
     sched_make_runnable(thr);
     intr_setipl(oldIPL);
 }