1 files changed, 1 insertions, 1 deletions
diff --git a/src/resolve.c b/src/resolve.c
index 572e0a9f3..92a937d45 100644
--- a/src/resolve.c
+++ b/src/resolve.c
@@ -973,7 +973,7 @@ static int resolveExprStep(Walker *pWalker, Expr *pExpr){
           Select *pSel = pNC->pWinSelect;
           assert( pWin==pExpr->y.pWin );
           if( IN_RENAME_OBJECT==0 ){
-            sqlite3WindowUpdate(pParse, pSel->pWinDefn, pWin, pDef);
+            sqlite3WindowUpdate(pParse, pSel ? pSel->pWinDefn : 0, pWin, pDef);
           }
           sqlite3WalkExprList(pWalker, pWin->pPartition);
           sqlite3WalkExprList(pWalker, pWin->pOrderBy);