diff --git a/src/Core/EmailChannel.php b/src/Core/EmailChannel.php
index dfa74f6..8fa2bbc 100644
--- a/src/Core/EmailChannel.php
+++ b/src/Core/EmailChannel.php
@@ -59,7 +59,7 @@ private static function renderMjml(string $mjml): string
 
     private static function fixHtml(string $html): string
     {
-        $config = HTMLPurifier_Config::createDefault();
+        $config = HTMLPurifier_Config::createDefault()->set('Cache.DefinitionImpl', null);
         $purifier = new HTMLPurifier($config);
         return $purifier->purify($html);
     }