It is supported - your file crashed though - probably due to something wrong with the file.
Make a backup Immediately!
Then you can try these steps to fix your document.
If that's not working then try
If it's still not working try
If you need any further assistance let us know.
How about if you turn off the tab leader?
Or if instead of the Right-Aligned tab at the edge of the frame you use a Right-Indent tab (Shift + Tab)?
If it works without the leader, or withthe right-indent tab, try adding a custom underline to the tab character (and you can do that as a character style, which can be added to the paragraph style as a nested style or GREP style, if you use this in a lot of places).