diff --git a/app/Filters/AllowCorsFilter.php b/app/Filters/AllowCorsFilter.php
index 91e6ed5d..ca64b7ca 100644
--- a/app/Filters/AllowCorsFilter.php
+++ b/app/Filters/AllowCorsFilter.php
@@ -12,11 +12,11 @@ class AllowCorsFilter implements FilterInterface
 {
     /**
      * @param string[]|null $arguments
-     * @return RequestInterface|ResponseInterface|string|void
+     * @return RequestInterface|ResponseInterface|string|null
      */
     public function before(RequestInterface $request, $arguments = null)
     {
-        // Do something here
+        return null;
     }
 
     /**
@@ -29,7 +29,7 @@ class AllowCorsFilter implements FilterInterface
             $response->setHeader('Cache-Control', 'public, max-age=86400');
         }
 
-        $response->setHeader('Access-Control-Allow-Origin', '*') // for allowing any domain, insecure
+        return $response->setHeader('Access-Control-Allow-Origin', '*') // for allowing any domain, insecure
             ->setHeader('Access-Control-Allow-Headers', '*') // for allowing any headers, insecure
             ->setHeader('Access-Control-Allow-Methods', 'GET, OPTIONS') // allows GET and OPTIONS methods only
             ->setHeader('Access-Control-Max-Age', '86400');
diff --git a/modules/Api/Rest/V1/Filters/ApiFilter.php b/modules/Api/Rest/V1/Filters/ApiFilter.php
index ff0a0715..dee4982c 100644
--- a/modules/Api/Rest/V1/Filters/ApiFilter.php
+++ b/modules/Api/Rest/V1/Filters/ApiFilter.php
@@ -65,10 +65,10 @@ class ApiFilter implements FilterInterface
     /**
      * @param string[]|null        $arguments
      *
-     * @return ResponseInterface|void
+     * @return ResponseInterface|null
      */
     public function after(RequestInterface $request, ResponseInterface $response, $arguments = null)
     {
-        // Do something here
+        return null;
     }
 }