diff --git a/kernel/sched.c b/kernel/sched.c
index 04228524d160..320e9a43d4cc 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -8350,7 +8350,7 @@ static unsigned long to_ratio(u64 period, u64 runtime)
 #ifdef CONFIG_CGROUP_SCHED
 static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
 {
-	struct task_group *tgi, *parent = tg->parent;
+	struct task_group *tgi, *parent = tg ? tg->parent : NULL;
 	unsigned long total = 0;
 
 	if (!parent) {