--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -3729,6 +3729,7 @@
 					(errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
 					 errmsg("there is no transaction in progress")));
 			s->blockState = TBLOCK_END;
+			chain = false;		/* Do not chain the implicit transaction */
 			result = true;
 			break;
 
@@ -3798,6 +3799,7 @@
 			ereport(WARNING,
 					(errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
 					 errmsg("there is no transaction in progress")));
+			chain = false;		/* Do not chain the implicit transaction */
 			result = true;
 			break;
 
@@ -3915,6 +3917,7 @@
 					(errcode(ERRCODE_NO_ACTIVE_SQL_TRANSACTION),
 					 errmsg("there is no transaction in progress")));
 			s->blockState = TBLOCK_ABORT_PENDING;
+			chain = false;		/* Do not chain the implicit transaction */
 			break;
 
 			/*