fix: Call to a member function getErrors() on null

Since CI 4.5.0, $this->validation may be null.

Author: kenjis

src/Models/CheckQueryReturnTrait.php

@@ -41,6 +41,8 @@ protected function checkQueryReturn($return): void
 
     protected function checkValidationError(): void
     {
+        $this->validation ??= service('validation');
+
         $validationErrors = $this->validation->getErrors();
 
         if ($validationErrors !== []) {