fix another TestCrashAPI failure

h2/src/main/org/h2/tools/SimpleResultSet.java

@@ -2252,6 +2252,7 @@ public class SimpleResultSet implements ResultSet, ResultSetMetaData,
     // --- private -----------------------------
 
     private void update(int columnIndex, Object obj) throws SQLException {
+        checkClosed();
         checkColumnIndex(columnIndex);
         this.currentRow[columnIndex - 1] = obj;
     }
@@ -2268,6 +2269,12 @@ public class SimpleResultSet implements ResultSet, ResultSetMetaData,
                 getSQLException();
     }
 
+    private void checkClosed() throws SQLException {
+        if (columns == null) {
+            throw DbException.get(ErrorCode.OBJECT_CLOSED).getSQLException();
+        }
+    }
+
     private void checkColumnIndex(int columnIndex) throws SQLException {
         if (columnIndex < 1 || columnIndex > columns.size()) {
             throw DbException.getInvalidValueException(