Issue #2926064 by alex_optim: Foreach error when editing style options

includes/charts.pages.inc

@@ -302,7 +302,13 @@ function charts_settings_form($form, $defaults = [], $field_options = [], $paren
     $form['fields']['table'] = [
       '#type'      => 'table',
       '#header'    => [t('Field Name'), t('Provides Data'), t('Color')],
-      '#tabledrag' => TRUE,
+      '#tabledrag' => [
+        [
+            'action' => 'order',
+            'relationship' => 'sibling',
+            'group' => 'weight',
+          ]
+        ],
     ];
 
     $field_count = 0;