Index: src/window.c
==================================================================
--- src/window.c
+++ src/window.c
@@ -2213,10 +2213,11 @@
   Window *pNew = 0;
   if( ALWAYS(p) ){
     pNew = sqlite3DbMallocZero(db, sizeof(Window));
     if( pNew ){
       pNew->zName = sqlite3DbStrDup(db, p->zName);
+      pNew->zBase = sqlite3DbStrDup(db, p->zBase);
       pNew->pFilter = sqlite3ExprDup(db, p->pFilter, 0);
       pNew->pFunc = p->pFunc;
       pNew->pPartition = sqlite3ExprListDup(db, p->pPartition, 0);
       pNew->pOrderBy = sqlite3ExprListDup(db, p->pOrderBy, 0);
       pNew->eFrmType = p->eFrmType;
@@ -2225,10 +2226,11 @@
       pNew->eExclude = p->eExclude;
       pNew->regResult = p->regResult;
       pNew->pStart = sqlite3ExprDup(db, p->pStart, 0);
       pNew->pEnd = sqlite3ExprDup(db, p->pEnd, 0);
       pNew->pOwner = pOwner;
+      pNew->bImplicitFrame = p->bImplicitFrame;
     }
   }
   return pNew;
 }
 

Index: test/windowB.test
==================================================================
--- test/windowB.test
+++ test/windowB.test
@@ -199,7 +199,35 @@
     {{"a":{"a":1,"e":9}}}
     {{"a":{"a":1,"e":9}}}
     {{"c":{"c":3,"e":9}}}
   }
 }
+
+#-------------------------------------------------------------------------
+reset_db
+do_execsql_test 4.0 {
+  CREATE TABLE x(a);
+  INSERT INTO x VALUES(1);
+  INSERT INTO x VALUES(2);
+}
+
+do_execsql_test 4.1 {
+  WITH y AS (
+      SELECT Row_Number() OVER (win) FROM x WINDOW win AS (PARTITION BY a)
+  )
+  SELECT * FROM y;
+} {
+  1 1
+}
+
+do_catchsql_test 4.2 {
+  WITH y AS (
+    SELECT Row_Number() OVER (win) FROM x WINDOW win AS (PARTITION
+  BY fake_column))
+  SELECT * FROM y;
+} {1 {no such column: fake_column}}
+
+do_catchsql_test 4.3 {
+  SELECT 1 WINDOW win AS (PARTITION BY fake_column);
+} {0 1}
 
 finish_test