Version 4.3.6

system/Login/Handler/OAuth1/Twitter.php

@@ -454,6 +454,11 @@ class _Twitter extends \IPS\Login\Handler\OAuth1
 		{
 			$response = $this->_sendRequest( 'get', \IPS\Http\Url::external('https://api.twitter.com/1.1/account/verify_credentials.json'), array(), $accessToken, $accessTokenSecret );
 			
+			if ( $response->httpResponseCode == 401 )
+			{
+				return FALSE;
+			}
+			
 			if ( $response->httpHeaders['x-access-level'] == 'read' )
 			{
 				return FALSE;