diff --git a/src/Model/Config.php b/src/Model/Config.php
index 562e452..d579b5b 100644
--- a/src/Model/Config.php
+++ b/src/Model/Config.php
@@ -40,7 +40,7 @@ public function __construct(
 
     protected function getKey()
     {
-        return trim($this->config->getValue(self::KEY_PATH));
+        return trim((string) $this->config->getValue(self::KEY_PATH));
     }
 
     public function hasKey()