diff --git a/src/Core/Worker.php b/src/Core/Worker.php
index 56c62451b9..21140b890e 100644
--- a/src/Core/Worker.php
+++ b/src/Core/Worker.php
@@ -311,6 +311,10 @@ class Worker
 		}
 
 		$argv = json_decode($queue['parameter'], true);
+		if (!is_array($argv)) {
+			$argv = [];
+		}
+
 		if (!empty($queue['command'])) {
 			array_unshift($argv, $queue['command']);
 		}