add error thrown before returning with declared returnType

src/Models/UserModel.php

@@ -21,6 +21,7 @@
 use CodeIgniter\Shield\Exceptions\InvalidArgumentException;
 use CodeIgniter\Shield\Exceptions\ValidationException;
 use Faker\Generator;
+use LogicException;
 
 /**
  * @phpstan-consistent-constructor
@@ -164,6 +165,10 @@ public function addToDefaultGroup(User $user): void
 
     public function fake(Generator &$faker): User
     {
+        if (! is_a($this->returnType, User::class, true)) {
+            throw new LogicException('Return type must be a subclass of ' . User::class);
+        }
+
         return new $this->returnType([
             'username' => $faker->unique()->userName(),
             'active'   => true,
@@ -226,6 +231,10 @@ public function findByCredentials(array $credentials): ?User
             $password_hash = $data['password_hash'];
             unset($data['password_hash']);
 
+            if (! is_a($this->returnType, User::class, true)) {
+                throw new LogicException('Return type must be a subclass of ' . User::class);
+            }
+
             $user                = new $this->returnType($data);
             $user->email         = $email;
             $user->password_hash = $password_hash;