Notice: Undefined offset: 1 in Drupal\simplesamlphp_auth\ error

Good morning,
Could you please help me understanding what causes the following error?

I believe it only appears on the first login, then it disappears. Should I just ignore it?

Hi Lina,

You should open a ticket to Drupal Infrastructure to take a closer look why the SimpleSAMLphp module throws this error.

Thank Sotirios. I have done that now.