diff --git a/snappymail/v/0.0.0/app/libraries/RainLoop/ServiceActions.php b/snappymail/v/0.0.0/app/libraries/RainLoop/ServiceActions.php
index a0894a2ff..f79c7aaae 100644
--- a/snappymail/v/0.0.0/app/libraries/RainLoop/ServiceActions.php
+++ b/snappymail/v/0.0.0/app/libraries/RainLoop/ServiceActions.php
@@ -551,7 +551,7 @@ class ServiceActions
 			$sTheme = $this->oActions->ValidateTheme($this->aPaths[4]);
 
 			$bAppDebug = $this->Config()->Get('debug', 'enable', false);
-			$sMinify = ($bAppDebug || $oConfig->Get('labs', 'use_app_debug_css', false)) ? '' : 'min';
+			$sMinify = ($bAppDebug || $this->Config()->Get('labs', 'use_app_debug_css', false)) ? '' : 'min';
 
 			$bCacheEnabled = !$bAppDebug && $this->Config()->Get('labs', 'cache_system_data', true);
 			if ($bCacheEnabled) {