Fixes #3727 - filter field being a closure

CHANGELOG.md

@@ -1,3 +1,9 @@
+# v1.7.42.1
+## mm/dd/2023
+
+2. [](#improved)
+   * Quick fix for `isDangerousFunction` when `$name` was a closure [#3727](https://github.com/getgrav/grav/issues/3727)
+
 # v1.7.42
 ## 06/14/2023
 

system/src/Grav/Common/Utils.php

@@ -2056,17 +2056,19 @@ abstract class Utils
             'forward_static_call_array',
         ];
 
-        $name = strtolower($name);
+        if (is_string($name)) {
+            $name = strtolower($name);
+        }
 
         if ($name instanceof \Closure) {
             return false;
         }
 
-        if (strpos($name, "\\") !== false) {
+        if (is_array($name) || strpos($name, ":") !== false) {
             return false;
         }
 
-        if (is_array($name) || strpos($name, ":") !== false) {
+        if (strpos($name, "\\") !== false) {
             return false;
         }