-Empty dataset can not be saved

src/Query/Values.php

@@ -10,7 +10,7 @@ class Values extends Fragment {
     
     public ? int $fieldCount = null;
     
-    public array $rows;
+    public array $rows = [];
     
     public QueryBuilderInterface $queryBuilder;
 
@@ -21,6 +21,10 @@ class Values extends Fragment {
     
     public function add(array $row) : self
     {
+        if ($row === []) {
+            return $this;
+        }
+
         if ($this->fieldCount === null) {        
             $this->fieldCount = count($row);
         }