diff --git a/src/Rector/MethodCall/EloquentOrderByToLatestOrOldestRector.php b/src/Rector/MethodCall/EloquentOrderByToLatestOrOldestRector.php
index d65d1464..e2372761 100644
--- a/src/Rector/MethodCall/EloquentOrderByToLatestOrOldestRector.php
+++ b/src/Rector/MethodCall/EloquentOrderByToLatestOrOldestRector.php
@@ -174,6 +174,7 @@ public function configure(array $configuration): void
     {
         $allowedPatterns = $configuration[self::ALLOWED_PATTERNS] ?? [];
         Assert::isArray($allowedPatterns);
+        Assert::allString($allowedPatterns);
 
         $this->allowedPatterns = $allowedPatterns;
     }