Version 5.0.6

system/Login/Handler/OAuth2/LinkedIn.php

@@ -338,14 +338,14 @@ class LinkedIn extends OAuth2
 	 * May return NULL if server doesn't support this
 	 *
 	 * @param	string	$identifier	The ID Number/string from remote service
-	 * @param	string	$username	The username from remote service
+	 * @param string|null $username	The username from remote service
 	 * @return	Url|NULL
 	 * @throws	Exception	The token is invalid and the user needs to reauthenticate
 	 * @throws	DomainException		General error where it is safe to show a message to the user
 	 * @throws	RuntimeException		Unexpected error from service
 	 * @note	You have to apply to LinkedIn's Partnership program manually to get the profile data necessary to generate the public profile URL (specifically, the vanityName field). As such, we can't generate the URL to your profile beginning with the v2 API.
 	 */
-	public function userLink( string $identifier, string $username ): ?Url
+	public function userLink( string $identifier, ?string $username ): ?Url
 	{		
 		return NULL;
 	}