When entering number of expected participants pressing enter does not save changes

[TjerkNan]

Describe the bug
When I enter a number of participants and press return the page reloads and the number doesn't change.

To Reproduce
Steps to reproduce the behavior:

1. Enter a number in the Expected number of participants field
2. Press enter

Observe that the page reloads and the old number stays.
When you don't press enter and just wait, the changed number is saved properly.
Other text fields don't create a page reload when pressing return.

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

Screenshots

press.enter.on.participants.number.reloads.mov

Desktop (please complete the following information):

• sarari