diff --git a/src/backend/utils/cache/plancache.c b/src/backend/utils/cache/plancache.c
index c96a86500a..6132856f04 100644
--- a/src/backend/utils/cache/plancache.c
+++ b/src/backend/utils/cache/plancache.c
@@ -1141,7 +1141,7 @@ CachedPlan *
 GetCachedPlan(CachedPlanSource *plansource, ParamListInfo boundParams,
 			  bool useResOwner)
 {
-	CachedPlan *plan;
+	CachedPlan *plan = NULL;
 	List	   *qlist;
 	bool		customplan;
 
@@ -1223,6 +1223,8 @@ GetCachedPlan(CachedPlanSource *plansource, ParamListInfo boundParams,
 		}
 	}
 
+	Assert(plan != NULL);
+
 	/* Flag the plan as in use by caller */
 	if (useResOwner)
 		ResourceOwnerEnlargePlanCacheRefs(CurrentResourceOwner);