Undefined index: token | WordPress.org

Hello, I hope this is fine, I have the following error on my website, I am a novice, please how can I solve it.

Undefined index: token

wp-content / mu-plugins / rms_unique_wp_mu_pl_fl_nm.php: 6
remote_sign_in ()
wp-includes / class-wp-hook.php: 287
do_action (‘init’)
wp-settings.php: 540

MU plugin: rms_unique_wp_mu_pl_fl_nm.php

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