E_ERROR on line 221 freemius/templates/connect.php

Since the update to version 2.1.3 I get a fatal error
Apperantly something goes wrong with Freemius

I run WordPress version: 6.0 in Dutch Language
(Freemius has had issues with other languages in the past).

Can you have a look at this issue?

Dutch error report:
===========
Een fout van het type E_ERROR werd veroorzaakt op regelnummer 221 van het bestand /www/wp-content/plugins/post-smtp/freemius/templates/connect.php. Foutmelding: Uncaught ValueError: Unknown format specifier “w” in /www/wp-content/plugins/post-smtp/freemius/templates/connect.php:221
Stack trace:
#0 /www/wp-content/plugins/post-smtp/freemius/templates/connect.php(221): sprintf(‘Mis nooit een b…’, ‘Post SMTP`

The page I need help with: [log in to see the link]