problem displaying wp article after updating nextgen 2.0.77

Hello,

after uploading to nextgen 2.0.77, my article with a bmo_scrollgallery are not displayed anymore. in stead i have multiple itaration of the following line :
Warning: Illegal string offset ‘saved’ in /web/htdocs/… …/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/nextgen_data/package.module.nextgen_data.php on line 2538.

I diactivate bmo_expo, to have my articles available, but I like your plugin and would like to use it again.
Do you know how to fix this ?

regards

francois

Ps for asimilar error, i found this website on google (not mine) :https://www.cogitoergoadsum.it/wordpress/fiori-di-cactus-e-non-solo.html

https://www.ads-software.com/plugins/bmo-expo/