1 files changed, 2 insertions, 1 deletions
diff --git a/src/expr.c b/src/expr.c
index 4d7258959..acc144bea 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1402,7 +1402,8 @@ static Expr *exprDup(sqlite3 *db, Expr *p, int dupFlags, u8 **pzBuffer){
         if( pNew->op==TK_SELECT_COLUMN ){
           pNew->pLeft = p->pLeft;
           assert( p->iColumn==0 || p->pRight==0 );
-          assert( p->pRight==0  || p->pRight==p->pLeft );
+          assert( p->pRight==0  || p->pRight==p->pLeft
+                                || ExprHasProperty(p->pLeft, EP_Subquery) );
         }else{
           pNew->pLeft = sqlite3ExprDup(db, p->pLeft, 0);
         }