Compatibility with PHP 7.4

diff --git a/wcfsetup/install/files/lib/system/api/leafo/scssphp/src/Compiler.php b/wcfsetup/install/files/lib/system/api/leafo/scssphp/src/Compiler.php
index 87fb8b25872dec5a3c47281a30a760f79b406395..d547c1564abd771c589ba3a604d6fbf7c1b20f8f 100644 (file)
--- a/wcfsetup/install/files/lib/system/api/leafo/scssphp/src/Compiler.php
+++ b/wcfsetup/install/files/lib/system/api/leafo/scssphp/src/Compiler.php
@@ -2044,6 +2044,9 @@ class Compiler
      */
     protected function reduce($value, $inExp = false)
     {
+        if ($value === null) {
+            return $value;
+        }
 
         switch ($value[0]) {
             case Type::T_EXPRESSION: