Version 1.9.0 Uncaught TypeError

Hi, I got this error today (after updating to 1.9.0):

Fehler-Details

==============

Ein Fehler vom Typ E_ERROR wurde in der Zeile 113 der Datei /home/poolfabi/www.poolfactory.at/wp-content/plugins/wp-last-modified-info/inc/Core/Notification.php verursacht. Fehlermeldung: Uncaught TypeError: explode(): Argument #2 ($string) must be of type string, array given in /home/poolfabi/www.poolfactory.at/wp-content/plugins/wp-last-modified-info/inc/Core/Notification.php:113

Stack trace:

#0 /home/poolfabi/www.poolfactory.at/wp-content/plugins/wp-last-modified-info/inc/Core/Notification.php(113): explode()

#1 /home/poolfabi/www.poolfactory.at/wp-includes/class-wp-hook.php(324): Wplmi\Core\Notification->email()

#2 /home/poolfabi/www.poolfactory.at/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()

#3 /home/poolfabi/www.poolfactory.at/wp-includes/plugin.php(517): WP_Hook->do_action()

#4 /home/poolfabi/www.poolfactory.at/wp-includes/post.php(4729): do_action()

#5 /home/poolfabi/www.poolfactory.at/wp-includes/post.php(4862): wp_insert_post()

#6 /home/poolfabi/www.poolfactory.at/wp-admin/includes/post.php(453): wp_update_post()

#7 /home/poolfabi/www.poolfactory.at/wp-admin/post.php(227): edit_post()

#8 {main}

  thrown

Best regards

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