diff --git a/sys/net/iflib.c b/sys/net/iflib.c
--- a/sys/net/iflib.c
+++ b/sys/net/iflib.c
@@ -1650,7 +1650,8 @@
 			return (result);
 	}
 
-	GROUPTASK_ENQUEUE(gtask);
+	if (gtask->gt_taskqueue != NULL)
+		GROUPTASK_ENQUEUE(gtask);
 	return (FILTER_HANDLED);
 }