diff --git a/sys/kern/kern_intr.c b/sys/kern/kern_intr.c
--- a/sys/kern/kern_intr.c
+++ b/sys/kern/kern_intr.c
@@ -533,7 +533,7 @@
 {
 
 	if (ie == NULL)
-		return (EINVAL);
+		return (0);
 
 	mtx_lock(&event_lock);
 	mtx_lock(&ie->ie_lock);