Warning: Array to string conversion (since v. 2.0.8)

Hi,
I must have accidentaly pressed the button “Remigrate size chart”. But I have also added one size chart in the current version so I’m not sure which event did this: now on every product page (just under tabs with options i.e. sizes) i got this PHP warning

Warning: Array to string conversion in /***/product-size-chart-for-woo/inc/frontend/front-end.php on line 69

My current version of PSCh plugin is 2.0.8 (WC 9.4.3, WP 6.6.2)
My previous version of the plugin was 2.0.6.

BTW UX/UI/functions changes in version 2 of your plugin are horrible!