Is this fixed in version 1.2.1? I'm using this widget with 2.5.1.1 and getting this error:
RichText_widget_SimpleRichTextEditor_0.destroy : Some trouble in uninitialize function : this.getDoc() is null
Emptied my cache but still occuring. It only happens when I click the save button. Then the popup remains and you can't do anything. Only refreshing the page works.