diff --git a/tests/pathological/convert.php b/tests/pathological/convert.php
index 51c6d42330..7c69002cde 100755
--- a/tests/pathological/convert.php
+++ b/tests/pathological/convert.php
@@ -35,10 +35,7 @@
     exit(1);
 }
 
-$config = [];
-if (isset($argv[1])) {
-    $config = \json_decode($argv[1], true);
-}
+$config = json_decode($argv[1] ?? '[]', true) ?? [];
 
 $environment = new Environment($config);
 $environment->addExtension(new CommonMarkCoreExtension());