Laravel - Unable to catch Tymon JWT TokenInvalidException

I am creating an API using Laravel 5.4 framework. Using JWT token, I am however unable to catch the InvalidTokenException when I input a wrong token. Please see my code and advice. Thank you!

    $token = $request->token;
    try{
        $user = JWTAuth::toUser($token);
    }catch(\Tymon\JWTAuth\Exceptions\TokenInvalidException $e){     //NOT CATCHING...
        $error = 'Invalid token';
        return response()->json(compact('error'));
    }

via Chebli Mohamed