diff --git a/file/js/be.bastelstu.WCF.Chat.coffee b/file/js/be.bastelstu.WCF.Chat.coffee
index 4b5dc16..825b5c6 100644
--- a/file/js/be.bastelstu.WCF.Chat.coffee
+++ b/file/js/be.bastelstu.WCF.Chat.coffee
@@ -192,7 +192,7 @@ window.console ?=
 			# Desktop Notifications
 			unless typeof window.webkitNotifications is 'undefined'
 				$('#timsChatNotify').click (event) ->
-					if $(@).data 'status' and window.webkitNotifications.checkPermission() isnt 0
+					if $(@).data('status') and window.webkitNotifications.checkPermission() isnt 0
 						window.webkitNotifications.requestPermission()
 			
 		###
@@ -280,8 +280,10 @@ window.console ?=
 				dataType: 'json'
 				type: 'POST'
 				success: $.proxy((data, textStatus, jqXHR) ->
+					WCF.DOMNodeInsertedHandler.enable()
 					@handleMessages(data.messages)
 					@handleUsers(data.users)
+					WCF.DOMNodeInsertedHandler.disable()
 				, @)
 				error: $.proxy((jqXHR, textStatus, errorThrown) ->
 					console.error 'Battle Station hit - shields at ' + (--@shields / 3 * 104) + ' percent'
diff --git a/file/lib/data/chat/room/ChatRoomAction.class.php b/file/lib/data/chat/room/ChatRoomAction.class.php
index 14f576a..afef181 100644
--- a/file/lib/data/chat/room/ChatRoomAction.class.php
+++ b/file/lib/data/chat/room/ChatRoomAction.class.php
@@ -84,19 +84,14 @@ public function prune() {
 	public function validateUpdatePosition() {
 		// validate permissions
 		if (is_array($this->permissionsUpdate) && count($this->permissionsUpdate)) {
-			try {
-				WCF::getSession()->checkPermissions($this->permissionsUpdate);
-			}
-			catch (\wcf\system\exception\PermissionDeniedException $e) {
-				throw new ValidateActionException('Insufficient permissions');
-			}
+			WCF::getSession()->checkPermissions($this->permissionsUpdate);
 		}
 		else {
-			throw new ValidateActionException('Insufficient permissions');
+			throw new PermissionDeniedException();
 		}
 		
 		if (!isset($this->parameters['data']['structure'])) {
-			throw new ValidateActionException('Missing parameter structure');
+			throw new UserInputException('structure');
 		}
 		
 		if (!isset($this->parameters['data']['offset'])) $this->parameters['data']['offset'] = 0;