diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0353002..7f4c66f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1396,6 +1396,9 @@
 
 	(void)first_zones_zonelist(zonelist, high_zoneidx, nodemask,
 							&preferred_zone);
+	if (!preferred_zone)
+		return NULL;
+
 	classzone_idx = zone_idx(preferred_zone);
 
 zonelist_scan: