From de8c842073d44afaeeeff627206bcbbb8c409adb Mon Sep 17 00:00:00 2001
From: Michael Roosz <michael.roosz@check24.de>
Date: Fri, 22 Apr 2022 15:53:55 +0200
Subject: [PATCH] Fix a "passing null  to parameter" warning

---
 Archiver.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Archiver.php b/Archiver.php
index 93defe7..b3d4e35 100644
--- a/Archiver.php
+++ b/Archiver.php
@@ -129,7 +129,7 @@ protected function aggregateFromVisits($query, $keyField, $valueField)
 
     protected function cleanCustomVarValue($value)
     {
-        if (strlen($value)) {
+        if ($value !== null && strlen($value)) {
             return $value;
         }
         return self::LABEL_CUSTOM_VALUE_NOT_DEFINED;