Call to a member function forceFill() on null, PersonalAccessTokenFactory.php

When I tried to use oauth laravel authentication, it produces the following error.I tried restarting redis and laravel server.Kindly help me to fix this issue.

  {
    "status": "error",
    "message": "{"status":"error","type":"exception","message":"Call to a member function forceFill() on null","file":"\/srv\/vendor\/laravel\/passport\/src\/PersonalAccessTokenFactory.php","line":78}"
}