Fix add column in good entity

Author: tsmr

ajax/kanban.php

@@ -243,6 +243,7 @@
     $params = $_POST['params'] ?? [];
     $column_item->add([
             'name'   => $_POST['column_name'],
+            'entities_id'    => $_SESSION['glpiactive_entity'],
         ] + $params);
 } elseif (($_POST['action'] ?? null) === 'save_column_state') {
     if (!isset($_POST['state'])) {

src/TaskState.php

@@ -160,7 +160,11 @@ public function showForm($ID, $options = [])
                     $possible_values[$datatype['id']] = $datatype['name'];
                 }
             }
-            $values = json_decode($this->fields['tasktypes']);
+            $values = [];
+            if ($this->fields['tasktypes'] != null) {
+                $values = json_decode($this->fields['tasktypes']);
+            }
+
             if (!is_array($values)) {
                 $values = [];
             }