Hello!
I had the same problem and resolved it by adding the following URLs to ...
Avast
Menu
Settings
General
Exclusions -> URLs -> hxtp://api.share-online.biz*
hxtp://www.share-online.biz*
hxtp://dlw*.share-online.biz*
and
Avast
Menu
Settings
Components
Web Shield - Customize
Exclusions -> URLs -> hxtp://share-online.biz*
Just try, if you want!
BR,
Michi