Uncaught Error: Cannot use object of type WP_Error as array in /var/www/html/wp-

Dear,

We are running your plugin and caught an exception.

The functionality works, but I want to share the stack trace.

Br, Maarten.

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When seeking help with this issue, you may be asked for some of the following information:
WordPress version 5.6.2
Current theme: Twenty Seventeen (version 2.5) Current plugin: DoLogin Security (version 3.0) PHP version 7.4.15

Error Details
=============
An error of type E_ERROR was caused in line 317 of the file /var/www/html/wp-content/plugins/dologin/src/auth.cls.php. Error message: Uncaught Error: Cannot use object of type WP_Error as array in /var/www/html/wp-content/plugins/dologin/src/auth.cls.php:317
Stack trace:
#0 /var/www/html/wp-includes/class-wp-hook.php(289): dologin\Auth->wp_login_failed()
#1 /var/www/html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters()
#2 /var/www/html/wp-includes/plugin.php(484): WP_Hook->do_action()
#3 /var/www/html/wp-includes/pluggable.php(572): do_action()
#4 /var/www/html/wp-includes/user.php(95): wp_authenticate()
#5 /var/www/html/wp-login.php(1257): wp_signon()
#6 {main}
  thrown