diff --git a/Listener/CommandListener.php b/Listener/CommandListener.php
index 46463cb..203d2fa 100644
--- a/Listener/CommandListener.php
+++ b/Listener/CommandListener.php
@@ -77,7 +77,7 @@ public function onConsoleCommand(ConsoleCommandEvent $event): void
                     $this->interactor->addCustomParameter($key.'['.$k.']', $v);
                 }
             } else {
-                $this->interactor->addCustomParameter($key, $value);
+                $this->interactor->addCustomParameter((string) $key, $value);
             }
         }
     }