Plugin deletes CSS class="widget"

Hi,

the plugin causes that the class=”widget” is stripped out from the primary sidebar of the HUEMAN theme, see here the screenshots:

http://ww.wp.xz.cn/support/topic/missing-css-class-widget-for-widgets-created-within-custom-sidebars

As soon as I decativate your plugin here, all is fine again.
Is there a fix for it?

Thanks.

https://ww.wp.xz.cn/plugins/q2w3-fixed-widget/