Trying to get property of non-object in ignore_user_comment line 271 of ignore_user/ignore_user.module

On posting a new comment I'm getting this message

    Notice: Trying to get property of non-object in ignore_user_comment() (line 271 of /srv/bindings/ab331aab8e404f6d89add5010badaee5/code/sites/all/modules/ignore_user/ignore_user.module).
    Notice: Trying to get property of non-object in ignore_user_comment() (line 271 of /srv/bindings/ab331aab8e404f6d89add5010badaee5/code/sites/all/modules/ignore_user/ignore_user.module).
    Notice: Trying to get property of non-object in ignore_user_comment() (line 271 of /srv/bindings/ab331aab8e404f6d89add5010badaee5/code/sites/all/modules/ignore_user/ignore_user.module).

It refers to this line

if (!$user || !$user->uid || !$comment->uid) {