Cannot submit user edit form

Summary

The user edit form can not be submitted.

Steps to Reproduce

Edit any user and try to submit the form (form is valid). No response is shown.

Additional Debug Information

The following output gets printed to the developer console

TypeError: Cannot read property '_id' of undefined
    at e.value (bundle.js:1)
    at bundle.js:1
    at new Promise (<anonymous>)
    at e.value (bundle.js:1)
    at t.value (bundle.js:1)
    at t.value (bundle.js:81)
    at HTMLAnchorElement.onclick (bundle.js:1)
    at HTMLAnchorElement.N.o (bundle.js:1)

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