diff --git a/file/js/be.bastelstu.Chat.litcoffee b/file/js/be.bastelstu.Chat.litcoffee
index a5468c7..60b9645 100644
--- a/file/js/be.bastelstu.Chat.litcoffee
+++ b/file/js/be.bastelstu.Chat.litcoffee
@@ -192,7 +192,7 @@ Open the smiley wcfDialog
 Handle private channel menu
 
 			$('#timsChatMessageTabMenu > .tabMenu').on 'click', '.timsChatMessageTabMenuAnchor', ->
-				openPrivateChannel $(@).data 'userID' 
+				openPrivateChannel $(@).data 'userID'
 
 Handle submitting the form. The message will be validated by some basic checks, passed to the `submit` eventlisteners
 and afterwards sent to the server by an AJAX request.
@@ -410,11 +410,19 @@ Show invite dialog.
 										success: (data) ->
 											do new WCF.System.Notification(WCF.Language.get 'wcf.global.success').show
 											
+										failure: (data) ->
+											return true unless (data?.returnValues?.errorType?) or (data?.message?)
+											
+											$("""<div class="ajaxDebugMessage">#{(data?.returnValues?.errorType) ? data.message}</div>""").wcfDialog title: WCF.Language.get 'wcf.global.error.title'
+											
+											return false
+											
 								$('#timsChatInviteDialog').wcfDialog 'close'
 								
 							timsChatInviteDialog.wcfDialog
 								title: WCF.Language.get 'chat.global.invite'
-								
+								onShow: ->  do $('#userInviteDialogUsernameInput').focus
+									
 
 Hide topic container.
 
diff --git a/file/lib/data/user/UserAction.class.php b/file/lib/data/user/UserAction.class.php
index 91cc035..a53b66b 100644
--- a/file/lib/data/user/UserAction.class.php
+++ b/file/lib/data/user/UserAction.class.php
@@ -67,12 +67,35 @@ public function validateInvite() {
 		if (!$this->room->canEnter()) throw new \wcf\system\exception\PermissionDeniedException();
 		
 		if (!isset($this->parameters['recipients'])) throw new \wcf\system\exception\UserInputException("recipients");
+		
+		$this->parameters['recipients'] = \wcf\util\ArrayUtil::toIntegerArray($this->parameters['recipients']);
+		
+		$ignoredByList = new \wcf\data\user\ignore\UserIgnoreList();
+		$ignoredByList->getConditionBuilder()->add('user_ignore.ignoreUserID = ?', array(WCF::getUser()->userID));
+		$ignoredByList->getConditionBuilder()->add('user_ignore.userID IN (?)', array($this->parameters['recipients']));
+		
+		if (!empty($ignoredByList->sqlSelects)) $ignoredByList->sqlSelects .= ',';
+		$ignoredByList->sqlSelects .= "user_ignore.ignoreID";
+		$ignoredByList->sqlSelects .= ", user_table.username";
+		$ignoredByList->sqlJoins .= " LEFT JOIN wcf".WCF_N."_user user_table ON (user_table.userID = user_ignore.userID)";
+		
+		$ignoredByList->readObjects();
+		$ignoredByUsers = $ignoredByList->getObjects();
+		
+		if (!empty($ignoredByUsers)) {
+			$usernames = array();
+			foreach ($ignoredByUsers as $user) {
+				$usernames[] = $user->username;
+			}
+			
+			throw new \wcf\system\exception\UserInputException("recipients", WCF::getLanguage()->getDynamicVariable('chat.error.invite.ignored', array('users' => $ignoredByUsers, 'usernames' => $usernames)));
+		}
 	}
 	
 	/**
 	 * Invites users.
 	 */
 	public function invite() {
-		\wcf\system\user\notification\UserNotificationHandler::getInstance()->fireEvent('invited', 'be.bastelstu.chat.room', new \chat\system\user\notification\object\RoomUserNotificationObject($this->room), \wcf\util\ArrayUtil::toIntegerArray($this->parameters['recipients']), array('userID' => WCF::getUser()->userID));
+		\wcf\system\user\notification\UserNotificationHandler::getInstance()->fireEvent('invited', 'be.bastelstu.chat.room', new \chat\system\user\notification\object\RoomUserNotificationObject($this->room), $this->parameters['recipients'], array('userID' => WCF::getUser()->userID));
 	}
 }
diff --git a/language/de.xml b/language/de.xml
index 27dd04c..bc58b85 100644
--- a/language/de.xml
+++ b/language/de.xml
@@ -149,6 +149,7 @@ Probieren Sie, den Chat neu zu laden<!-- , bei Risiken und Nebenwirkungen fragen
 		<item name="chat.error.reload"><![CDATA[Neu laden]]></item>
 		
 		<item name="chat.error.whisper.ignoresYou"><![CDATA[„{$user}“ hat Sie blockiert.]]></item>
+		<item name="chat.error.invite.ignored"><![CDATA[Die folgenden Nutzer haben Sie blockiert: {implode from=$usernames item=username}{$username}{/implode}]]></item>
 	</category>
 	
 	<category name="chat.global">
diff --git a/language/en.xml b/language/en.xml
index 2ed941b..d521dcd 100644
--- a/language/en.xml
+++ b/language/en.xml
@@ -149,6 +149,7 @@ Please try to reload the chat.]]></item>
 		<item name="chat.error.reload"><![CDATA[Reload]]></item>
 		
 		<item name="chat.error.whisper.ignoresYou"><![CDATA[“{$user}” has blocked you.]]></item>
+		<item name="chat.error.invite.ignored"><![CDATA[The following users have blocked you: {implode from=$usernames item=username}{$username}{/implode}]]></item>
 	</category>
 	
 	<category name="chat.global">