diff --git a/src/backend/commands/trigger.c b/src/backend/commands/trigger.c
index 96ec841f847269ee1d60e7767a8a93f718a117a9..07033dc02fb5e634837df95280b0d479c47930f7 100644
--- a/src/backend/commands/trigger.c
+++ b/src/backend/commands/trigger.c
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/trigger.c,v 1.227.2.2 2008/12/13 02:00:29 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/trigger.c,v 1.227.2.3 2009/10/27 20:14:39 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -3606,8 +3606,15 @@ AfterTriggerSaveEvent(ResultRelInfo *relinfo, int event, bool row_trigger,
 	ItemPointerData oldctid;
 	ItemPointerData newctid;
 
+	/*
+	 * Check state.  We use normal tests not Asserts because it is possible
+	 * to reach here in the wrong state given misconfigured RI triggers,
+	 * in particular deferring a cascade action trigger.
+	 */
 	if (afterTriggers == NULL)
 		elog(ERROR, "AfterTriggerSaveEvent() called outside of transaction");
+	if (afterTriggers->query_depth < 0)
+		elog(ERROR, "AfterTriggerSaveEvent() called outside of query");
 
 	/*
 	 * Get the CTID's of OLD and NEW