diff --git a/src/backend/utils/adt/arrayfuncs.c b/src/backend/utils/adt/arrayfuncs.c
index 82d79977d7a4a37c2707a653a131bcd5be02adc6..42cdbc7d6e0d94216b39c8989234cba7272a69cd 100644
--- a/src/backend/utils/adt/arrayfuncs.c
+++ b/src/backend/utils/adt/arrayfuncs.c
@@ -4110,7 +4110,7 @@ array_contain_compare(AnyArrayType *array1, AnyArrayType *array2, Oid collation,
 		for (j = 0; j < nelems2; j++)
 		{
 			Datum		elt2 = values2[j];
-			bool		isnull2 = nulls2[j];
+			bool		isnull2 = nulls2 ? nulls2[j] : false;
 			bool		oprresult;
 
 			if (isnull2)