From 1bfb2283adc7fdbc5d25af270a7bd4c3561568c8 Mon Sep 17 00:00:00 2001
From: Vincent Langlet <VincentLanglet@users.noreply.github.com>
Date: Sat, 12 Dec 2020 19:31:17 +0100
Subject: [PATCH] Check for _per_page existence

---
 src/Admin/AbstractAdmin.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Admin/AbstractAdmin.php b/src/Admin/AbstractAdmin.php
index 0d78d1a599..80666fa528 100644
--- a/src/Admin/AbstractAdmin.php
+++ b/src/Admin/AbstractAdmin.php
@@ -923,7 +923,7 @@ public function getFilterParameters()
             }
         }
 
-        if (!$this->determinedPerPageValue($parameters['_per_page'])) {
+        if (!isset($parameters['_per_page']) || !$this->determinedPerPageValue($parameters['_per_page'])) {
             $parameters['_per_page'] = $this->getMaxPerPage();
         }