diff --git a/Module/ModuleManager.php b/Module/ModuleManager.php
index 2e338d51f..efd72eaef 100644
--- a/Module/ModuleManager.php
+++ b/Module/ModuleManager.php
@@ -242,6 +242,7 @@ class ModuleManager
      */
     public function getAvailableModules() : array
     {
+        return [];
     }
 
     /**
@@ -410,13 +411,13 @@ class ModuleManager
      *
      * @param string $module Module name
      *
-     * @return bool
+     * @return void
      *
      * @throws InvalidModuleException Throws this exception in case the installer doesn't exist
      *
      * @since  1.0.0
      */
-    public function reInit(string $module) : bool
+    public function reInit(string $module) /* : void */
     {
         $info = $this->loadInfo($module);
         $class = '\\Modules\\' . $info->getDirectory() . '\\Admin\\Installer';
diff --git a/Stdlib/Map/MultiMap.php b/Stdlib/Map/MultiMap.php
index f66228cab..580867753 100644
--- a/Stdlib/Map/MultiMap.php
+++ b/Stdlib/Map/MultiMap.php
@@ -290,24 +290,20 @@ class MultiMap implements \Countable
      *
      * @param mixed $key Key used to identify value
      *
-     * @return bool
+     * @return void
      *
      * @since  1.0.0
      */
-    private function removeMultiple($key) : bool
+    private function removeMultiple($key) /* : void */
     {
         if ($this->orderType === OrderType::LOOSE) {
             $keys = Permutation::permut($key);
 
-            $removed = false;
-
             foreach ($keys as $key => $value) {
-                $removed |= $this->remove(implode(':', $value));
+                $this->remove(implode(':', $value));
             }
-
-            return $removed;
         } else {
-            return $this->remove(implode(':', $key));
+            $this->remove(implode(':', $key));
         }
     }