w3c error

You can fix it yourself by editing this file:

wp-content/plugins/addthis/backend/AddThisPlugin.php around line 846.

Find: $script .= ' <script data-cfasync="false" type="text/javascript"'
Replace: $script .= ' <script data-cfasync="false" type="text/javascript" '

Also, according to W3C HTML5 validation, type is not even needed anymore, so it can be:
Replace: $script .= ' <script data-cfasync="false" '

Note that unless the developer fixes it, the next update will undo the fix outlined above.

@prokreeger Thanks for letting us know and thanks to @dg1 for offering a solution!

I’ve just created a ticket for our plugin team to fix this issue within one of our future release versions.