diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 09370a8a5a0..cc08af647e1 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -766,6 +766,9 @@ InsertPgAttributeTuples(Relation pg_attribute_rel,
 
 		ExecClearTuple(slot[slotCount]);
 
+		memset(slot[slotCount]->tts_isnull, false,
+			   slot[slotCount]->tts_tupleDescriptor->natts * sizeof(bool));
+
 		if (new_rel_oid != InvalidOid)
 			slot[slotCount]->tts_values[Anum_pg_attribute_attrelid - 1] = ObjectIdGetDatum(new_rel_oid);
 		else
diff --git a/src/backend/catalog/pg_shdepend.c b/src/backend/catalog/pg_shdepend.c
index f8c1fd1806f..d0c96b6de1d 100644
--- a/src/backend/catalog/pg_shdepend.c
+++ b/src/backend/catalog/pg_shdepend.c
@@ -907,6 +907,9 @@ copyTemplateDependencies(Oid templateDbId, Oid newDbId)
 
 		ExecClearTuple(slot[slot_stored_count]);
 
+		memset(slot[slot_stored_count]->tts_isnull, false,
+			   slot[slot_stored_count]->tts_tupleDescriptor->natts * sizeof(bool));
+
 		shdep = (Form_pg_shdepend) GETSTRUCT(tup);
 
 		slot[slot_stored_count]->tts_values[Anum_pg_shdepend_dbid - 1] = ObjectIdGetDatum(newDbId);