diff --git a/kernel/pid.c b/kernel/pid.c
index 3f9490082180f48f2876d69f10e4c6a1f35f1f46..1328dc2b7be61260bdb98b4f9b3cf59a0761ddf6 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -478,7 +478,7 @@ pid_t pid_nr_ns(struct pid *pid, struct pid_namespace *ns)
 	struct upid *upid;
 	pid_t nr = 0;
 
-	if (pid && ns->level <= pid->level) {
+	if (pid && ns && ns->level <= pid->level) {
 		upid = &pid->numbers[ns->level];
 		if (upid->ns == ns)
 			nr = upid->nr;