Index: src/trigger.c
==================================================================
--- src/trigger.c
+++ src/trigger.c
@@ -388,11 +388,15 @@
   ExprList *pEList,    /* The SET clause: list of column and new values */
   Expr *pWhere,        /* The WHERE clause */
   int orconf           /* The conflict algorithm. (OE_Abort, OE_Ignore, etc) */
 ){
   TriggerStep *pTriggerStep = sqliteMalloc(sizeof(TriggerStep));
-  if( pTriggerStep==0 ) return 0;
+  if( pTriggerStep==0 ){
+     sqlite3ExprListDelete(pEList);
+     sqlite3ExprDelete(pWhere);
+     return 0;
+  }
 
   pTriggerStep->op = TK_UPDATE;
   pTriggerStep->target  = *pTableName;
   pTriggerStep->pExprList = pEList;
   pTriggerStep->pWhere = pWhere;