"Illegal string offset" error from Widget

Throws error message in place of the Title from the Share Buttons widget:
Warning: Illegal string offset 'url' on line 649…

Sorry, no link available: developing on local server (for just this reason).

Fixed with a hack described elsewhere in the forum (here).

Trying to find the previous version to downgrade.

Thanks.

https://wordpress.org/plugins/simple-share-buttons-adder/