It throws an Exception for invalid Filters array

flight/core/Dispatcher.php

@@ -165,9 +165,13 @@ class Dispatcher
      *
      * @throws Exception If an event throws an `Exception`.
      */
-    public function filter(array $filters, array &$params, &$output): void
+    public static function filter(array $filters, array &$params, &$output): void
     {
-        foreach ($filters as $callback) {
+        foreach ($filters as $key => $callback) {
+            if (!is_callable($callback)) {
+                throw new InvalidArgumentException("Invalid callable \$filters[$key].");
+            }
+
             $continue = $callback($params, $output);
 
             if ($continue === false) {

tests/DispatcherTest.php

@@ -194,6 +194,20 @@ class DispatcherTest extends TestCase
         restore_error_handler();
     }
 
+    public function testItThrowsAnExceptionForInvalidFilters(): void
+    {
+        $this->expectException(Exception::class);
+        $this->expectExceptionMessage('Invalid callable $filters[1]');
+
+        $params = [];
+        $output = '';
+        $validCallable = function (): void {
+        };
+        $invalidCallable = 'invalidGlobalFunction';
+
+        Dispatcher::filter([$validCallable, $invalidCallable], $params, $output);
+    }
+
     public function testCallFunction4Params(): void
     {
         $myFunction = function ($param1, $param2, $param3, $param4) {