From c145d77c2268d3f81f2e43cf60bcb530811a0e4d Mon Sep 17 00:00:00 2001
From: Arthur Schiwon <blizzz@arthur-schiwon.de>
Date: Fri, 10 Mar 2023 14:37:33 +0100
Subject: [PATCH] fix possible PHP warning

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>
---
 apps/workflowengine/lib/Check/FileSystemTags.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/apps/workflowengine/lib/Check/FileSystemTags.php b/apps/workflowengine/lib/Check/FileSystemTags.php
index 008f47eca78..a920cd52a31 100644
--- a/apps/workflowengine/lib/Check/FileSystemTags.php
+++ b/apps/workflowengine/lib/Check/FileSystemTags.php
@@ -120,6 +120,9 @@ class FileSystemTags implements ICheck, IFileCheck {
 			}
 		}
 
+		if (!$systemTags) {
+			return [];
+		}
 		$systemTags = call_user_func_array('array_merge', $systemTags);
 		$systemTags = array_unique($systemTags);
 		return $systemTags;