diff --git a/src/Pecee/SimpleRouter/Route/Route.php b/src/Pecee/SimpleRouter/Route/Route.php
index 9545257..1e04dde 100644
--- a/src/Pecee/SimpleRouter/Route/Route.php
+++ b/src/Pecee/SimpleRouter/Route/Route.php
@@ -70,7 +70,7 @@ abstract class Route implements IRoute
         $callback = $this->getCallback();
 
         if ($callback === null) {
-            return;
+            return null;
         }
 
         /* Render callback function */
@@ -162,7 +162,7 @@ abstract class Route implements IRoute
             if (isset($parameters[1]) === true) {
 
                 /* Only take matched parameters with name */
-                foreach ($parameters[1] as $name) {
+                foreach ((array)$parameters[1] as $name) {
                     $values[$name] = (isset($matches[$name]) && $matches[$name] !== '') ? $matches[$name] : null;
                 }
             }
diff --git a/src/Pecee/SimpleRouter/Route/RouteGroup.php b/src/Pecee/SimpleRouter/Route/RouteGroup.php
index d15c343..d4dd64d 100644
--- a/src/Pecee/SimpleRouter/Route/RouteGroup.php
+++ b/src/Pecee/SimpleRouter/Route/RouteGroup.php
@@ -48,7 +48,7 @@ class RouteGroup extends Route implements IGroupRoute
      */
     public function matchRoute($url, Request $request)
     {
-        if($this->prefix !== null) {
+        if ($this->prefix !== null) {
             /* Parse parameters from current route */
             $parameters = $this->parseParameters($this->prefix, $url);
 
@@ -162,7 +162,7 @@ class RouteGroup extends Route implements IGroupRoute
             $this->setExceptionHandlers((array)$values['exceptionHandler']);
         }
 
-        if ($merge === false &&isset($values['domain'])) {
+        if ($merge === false && isset($values['domain'])) {
             $this->setDomains((array)$values['domain']);
         }
 
diff --git a/src/Pecee/SimpleRouter/Router.php b/src/Pecee/SimpleRouter/Router.php
index 5fd5824..02837fc 100644
--- a/src/Pecee/SimpleRouter/Router.php
+++ b/src/Pecee/SimpleRouter/Router.php
@@ -258,6 +258,7 @@ class Router
                     if ($rewriteUrl !== null && $rewriteUrl !== $url) {
                         unset($this->processedRoutes[$i]);
                         $this->processedRoutes = array_values($this->processedRoutes);
+
                         return $this->routeRequest(true);
                     }
 
@@ -334,6 +335,7 @@ class Router
                 if ($rewriteUrl !== null && $rewriteUrl !== $url) {
                     unset($this->exceptionHandlers[$i]);
                     $this->exceptionHandlers = array_values($this->exceptionHandlers);
+
                     return $this->routeRequest(true);
                 }
             }
diff --git a/test/RouterGroupTest.php b/test/RouterGroupTest.php
new file mode 100644
index 0000000..ff806d7
--- /dev/null
+++ b/test/RouterGroupTest.php
@@ -0,0 +1,29 @@
+<?php
+
+require_once 'Dummy/DummyMiddleware.php';
+require_once 'Dummy/DummyController.php';
+require_once 'Dummy/Handler/ExceptionHandler.php';
+require_once 'Helpers/TestRouter.php';
+
+class RouterGroupTest extends PHPUnit_Framework_TestCase
+{
+
+    public function testParameters()
+    {
+        $result1 = null;
+        $result2 = null;
+
+        TestRouter::group(['prefix' => '{param1}/{param2}'], function ($param1 = null, $param2 = null) use (&$result1, &$result2) {
+            $result1 = $param1;
+            $result2 = $param2;
+
+            TestRouter::get('/', 'DummyController@method1');
+        });
+
+        TestRouter::debug('/param1/param2', 'get');
+
+        $this->assertEquals('param1', $result1);
+        $this->assertEquals('param2', $result2);
+    }
+
+}
\ No newline at end of file