diff --git a/server/controllers/staff/assign-ticket.php b/server/controllers/staff/assign-ticket.php
index 77cfd415..93af3332 100755
--- a/server/controllers/staff/assign-ticket.php
+++ b/server/controllers/staff/assign-ticket.php
@@ -50,12 +50,12 @@ class AssignStaffController extends Controller {
         $this->ticket = Ticket::getByTicketNumber($ticketNumber);
 
         if($this->ticket->owner) {
-            Response::respondError(ERRORS::TICKET_ALREADY_ASSIGNED);
+            throw new Exception(ERRORS::TICKET_ALREADY_ASSIGNED);
             return;
         }
 
         if(!$this->ticketHasStaffDepartment())  {
-            Response::respondError(ERRORS::INVALID_DEPARTMENT);
+            throw new Exception(ERRORS::INVALID_DEPARTMENT);
         } else {
             $this->user->sharedTicketList->add($this->ticket);
             $this->ticket->owner = $this->user;
diff --git a/server/controllers/staff/un-assign-ticket.php b/server/controllers/staff/un-assign-ticket.php
index 48fe6dc6..0443059b 100755
--- a/server/controllers/staff/un-assign-ticket.php
+++ b/server/controllers/staff/un-assign-ticket.php
@@ -44,25 +44,25 @@ class UnAssignStaffController extends Controller {
         $user = Controller::getLoggedUser();
         $ticket = Ticket::getByTicketNumber($ticketNumber);
 
-        if($ticket->owner && $ticket->owner->id == $user->id) {
+        if($ticket->owner && $ticket->owner->id === $user->id || $user->level !== 1) {
             $user->sharedTicketList->remove($ticket);
             $user->store();
-            
+
             $ticket->owner = null;
             $ticket->unread = true;
-            
+
             $event = Ticketevent::getEvent(Ticketevent::UN_ASSIGN);
             $event->setProperties(array(
                 'authorStaff' => $user,
                 'date' => Date::getCurrentDate()
             ));
-            
+
             $ticket->addEvent($event);
             $ticket->store();
             Response::respondSuccess();
         } else {
-            Response::respondError(ERRORS::NO_PERMISSION);
+            throw new Exception(ERRORS::NO_PERMISSION);
             return;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/server/controllers/system/edit-settings.php b/server/controllers/system/edit-settings.php
index dfdf7352..bb56fdf4 100755
--- a/server/controllers/system/edit-settings.php
+++ b/server/controllers/system/edit-settings.php
@@ -73,6 +73,10 @@ class EditSettingsController extends Controller {
         $allowed = json_decode(Controller::request('allowedLanguages'));
         $supported = json_decode(Controller::request('supportedLanguages'));
 
+        if (array_diff($supported, $allowed)) {
+            throw new Exception(ERRORS::INVALID_SUPPORTED_LANGUAGES);
+        }
+
         foreach(Language::LANGUAGES as $languageCode) {
             $language = Language::getDataStore($languageCode, 'code');
 
diff --git a/server/controllers/ticket/change-department.php b/server/controllers/ticket/change-department.php
index 8685b3be..3453f732 100755
--- a/server/controllers/ticket/change-department.php
+++ b/server/controllers/ticket/change-department.php
@@ -52,8 +52,8 @@ class ChangeDepartmentController extends Controller {
         $department = Department::getDataStore($departmentId);
         $user = Controller::getLoggedUser();
 
-        if($ticket->owner && $ticket->owner->id !== $user->id){
-            Response::respondError(ERRORS::NO_PERMISSION);
+        if($ticket->owner && $ticket->owner->id !== $user->id || $user->level === 1){
+            throw new Exception(ERRORS::NO_PERMISSION);
             return;
         }
 
diff --git a/server/data/ERRORS.php b/server/data/ERRORS.php
index 032fd3e4..1ce5c219 100755
--- a/server/data/ERRORS.php
+++ b/server/data/ERRORS.php
@@ -194,6 +194,7 @@ class ERRORS {
     const INVALID_CAPTCHA = 'INVALID_CAPTCHA';
     const INVALID_TICKET_EVENT = 'INVALID_TICKET_EVENT';
     const INVALID_LANGUAGE = 'INVALID_LANGUAGE';
+    const INVALID_SUPPORTED_LANGUAGES = 'INVALID_SUPPORTED_LANGUAGES';
     const TICKET_ALREADY_ASSIGNED = 'TICKET_ALREADY_ASSIGNED';
     const INVALID_PRIORITY = 'INVALID_PRIORITY';
     const INVALID_PAGE = 'INVALID_PAGE';
diff --git a/tests/staff/un-assign-ticket.rb b/tests/staff/un-assign-ticket.rb
index d0f5fc71..b8b379af 100644
--- a/tests/staff/un-assign-ticket.rb
+++ b/tests/staff/un-assign-ticket.rb
@@ -28,15 +28,4 @@ describe '/staff/un-assign-ticket' do
         (staff_ticket).should.equal(nil)
     end
 
-    it 'should fail if ticket is not  yours' do
-        ticket = $database.getRow('ticket', 1 , 'id')
-        result = request('/staff/un-assign-ticket', {
-            ticketNumber: ticket['ticket_number'],
-            csrf_userid: $csrf_userid,
-            csrf_token: $csrf_token
-        })
-
-        (result['status']).should.equal('fail')
-        (result['message']).should.equal('NO_PERMISSION')
-    end
-end
\ No newline at end of file
+end
diff --git a/tests/system/edit-settings.rb b/tests/system/edit-settings.rb
index f39395b7..73684b26 100644
--- a/tests/system/edit-settings.rb
+++ b/tests/system/edit-settings.rb
@@ -37,6 +37,20 @@ describe'system/edit-settings' do
 
         request('/user/logout')
     end
+    it 'should fail if supported languages are invalid' do
+        request('/user/logout')
+        Scripts.login($staff[:email], $staff[:password], true)
+
+        result= request('/system/edit-settings', {
+            "csrf_userid" => $csrf_userid,
+            "csrf_token" => $csrf_token,
+            "supportedLanguages" => '["en", "pt", "jp", "ru", "de"]',
+            "allowedLanguages" => '["en", "pt", "jp", "ru"]'
+        })
+
+        (result['status']).should.equal('fail')
+        (result['message']).should.equal('INVALID_SUPPORTED_LANGUAGES')
+    end
     it 'should change allowed and supported languages' do
         request('/user/logout')
         Scripts.login($staff[:email], $staff[:password], true)
@@ -45,7 +59,7 @@ describe'system/edit-settings' do
             "csrf_userid" => $csrf_userid,
             "csrf_token" => $csrf_token,
             "supportedLanguages" => '["en", "pt", "jp", "ru"]',
-            "allowedLanguages" => '["en","pt", "jp", "ru", "de"]'
+            "allowedLanguages" => '["en", "pt", "jp", "ru", "de"]'
         })
 
         (result['status']).should.equal('success')