Version 5.0.0 beta 3

system/Login/Handler/OAuth2/Facebook.php

@@ -316,7 +316,7 @@ class Facebook extends OAuth2
 		
 		$photoVars = explode( ':', $member->group['g_photo_max_vars'] );		
 		$response = $this->_authorizedRequest( "{$link['token_identifier']}/picture?width={$photoVars[1]}&redirect=false", $link['token_access_token'], NULL, 'get' );
-		if ( !$response['data']['is_silhouette'] )
+		if ( !$response['data']['is_silhouette'] and isset( $response['data']['url'] ) and $response['data']['url'] )
 		{
 			return Url::external( $response['data']['url'] );
 		}