Lumen: 25810 segmentation fault (core dumped)

I am using Lumen micro-framework for creating REST APIs. For token based authentication I was using a tymon/jwt-auth package. Followed all the steps mentioned in following blog. When I do a post request for token fetching, get the following error: 25810 segmentation fault (core dumped)

On debugging, it was found that In /vendor/tymon/jwt-auth/src/Providers/Auth/IlluminateAuthAdapter.php around line number 31

return $this->auth->once($credentials); is creating problem.

After adding a debugging statement

print_r(get_class_methods(get_class($this->auth)));

The output was

Array
(
    [0] => __construct
    [1] => guard
    [2] => createSessionDriver
    [3] => createTokenDriver
    [4] => getDefaultDriver
    [5] => shouldUse
    [6] => setDefaultDriver
    [7] => viaRequest
    [8] => extend
    [9] => provider
    [10] => __call
    [11] => createUserProvider
)

So how come the object is accessing once method, when it is not in the scope.

Can you please suggest, where I am wrong.

Thanks.

via Chebli Mohamed