diff --git a/src/backend/commands/event_trigger.c b/src/backend/commands/event_trigger.c
index 2c1dc47541..9a702e4097 100644
--- a/src/backend/commands/event_trigger.c
+++ b/src/backend/commands/event_trigger.c
@@ -1761,7 +1761,7 @@ EventTriggerCollectAlterTableSubcmd(Node *subcmd, ObjectAddress address)
 		return;
 
 	Assert(IsA(subcmd, AlterTableCmd));
-	Assert(OidIsValid(currentEventTriggerState->currentCommand));
+	Assert(currentEventTriggerState->currentCommand != NULL);
 	Assert(OidIsValid(currentEventTriggerState->currentCommand->d.alterTable.objectId));
 
 	oldcxt = MemoryContextSwitchTo(currentEventTriggerState->cxt);