1 files changed, 4 insertions, 1 deletions
diff --git a/src/select.c b/src/select.c
index 176115689..92c2ecf8f 100644
--- a/src/select.c
+++ b/src/select.c
@@ -3627,7 +3627,10 @@ static Expr *substExpr(
         }
         testcase( ExprHasProperty(pCopy, EP_Subquery) );
         pNew = sqlite3ExprDup(db, pCopy, 0);
-        if( pNew==0 ) return pExpr;
+        if( db->mallocFailed ){
+          sqlite3ExprDelete(db, pNew);
+          return pExpr;
+        }
         if( pSubst->isLeftJoin ){
           ExprSetProperty(pNew, EP_CanBeNull);
         }