From ca0490a2d598db3d814ab27fd36b26ff29af99d5 Mon Sep 17 00:00:00 2001
From: Vincent Vanwaelscappel <vincent@cubedesigners.com>
Date: Wed, 19 Jan 2022 13:29:06 +0100
Subject: [PATCH] wip #4804

---
 src/Document.php | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/Document.php b/src/Document.php
index c539ec8..6363084 100644
--- a/src/Document.php
+++ b/src/Document.php
@@ -145,11 +145,13 @@ class Document
     }
 
     /**
-     * @param string|array $keywords
+     * @param string|array|null $keywords
      */
-    public function setKeywords(string|array $keywords): void
+    public function setKeywords(string|array|null $keywords): void
     {
-        if (is_array($keywords)) {
+        if(null===$keywords){
+            $keywords='';
+        }else        if (is_array($keywords)) {
             $keywords = implode(' ', $keywords);
         }
         $this->keywords = $keywords;
-- 
2.39.5