Can't add books to shelve on nightly version

[BrianTipton1]

Describe the bug/problem
On the nightly version I am unable to add books to a shelf. Dev tools shows that it returns a 400 on the request. Switching to stable does not have this problem.

To Reproduce
Steps to reproduce the behavior:

1. Attempt to add book to shelf

Logfile
No info in log file that I can find when in debug mode

Expected behavior
A clear and concise description of what you expected to happen.

Screenshot
Screen shot of request from devtools

Environment (please complete the following information):

• Docker container: [LinuxServer]:

[OzzieIsaacs]

Newest nightly version from 3 days ago? Start of january it was indeed broken

[BrianTipton1]

Yes the version from 1/10

[OzzieIsaacs]

I‘ll check

[nwskier]

Nightly from 1/16 has this issue still as well.
Running on Pip install.
Here is my console capture:
DevTools failed to load source map: Could not load content for http://192.168.1.36:8083/static/js/libs/jquery.form.min.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

[OzzieIsaacs]

Should be fixed now.

Over 300 tests but none of them is click on the add to shelf button on the popup page (if you click on edit and then cancel you will get to the site where the books details are visible on a fullpage, there it was working...)
I will do a new release next weekend, this will cause a lot of trouble