diff --git a/docker-compose.yml b/docker-compose.yml
index 7657147aa..cfb2ec969 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,3 @@
-version: "3.0"
 services:
   application:
     build:
diff --git a/includes/Fragments/TemplateOutput.php b/includes/Fragments/TemplateOutput.php
index 3692a1318..772cf6300 100644
--- a/includes/Fragments/TemplateOutput.php
+++ b/includes/Fragments/TemplateOutput.php
@@ -44,6 +44,7 @@ final protected function setUpSmarty()
     {
         $this->smarty = new Smarty();
         $this->smarty->addPluginsDir($this->getSiteConfiguration()->getFilePath() . '/smarty-plugins');
+        $this->smarty->registerPlugin('modifier', 'implode', 'implode');
 
         $this->assign('currentUser', User::getCommunity());
         $this->assign('skin', 'auto');