### Steps to reproduce

Begin of the deletion _Please write down the steps to reproduce. Try to write down all necessary preconditions (what permissions do you have, are other users involved?). Example:_

End of the deletion 1. Login as a user with permissions to Begin of the insertioncomment on a work packageEnd of the insertion Begin of the deletion manage members in project AEnd of the deletion

2. Go to the Begin of the insertionwork package, input a commentEnd of the insertion Begin of the deletion members pageEnd of the deletion

3. Click on Begin of the insertionsubmit multiple timesEnd of the insertion Begin of the deletion "Add new member"

4. Type the following string: "foo@example.org"End of the deletion


### What is the buggy behavior?

Begin of the deletion _Please describe the bug in as much detail as possible. Example:_

End of the deletion * Begin of the insertionIn some cases two journals are returnedEnd of the insertion Begin of the deletion The button to invite a member did not work

* There was an error notification shown with the message "XYZ"End of the deletion


### What is the expected behavior?

Begin of the deletion _Describe how the application should behave like. Example:_

End of the deletion 1. Begin of the insertionOnly one journalEnd of the insertion Begin of the deletion The applicationEnd of the deletion should Begin of the insertionbe returned on submitEnd of the insertion Begin of the deletion invite the new user with the selected roleEnd of the deletion

2. Begin of the insertionThe submit buttonEnd of the insertion Begin of the deletion An emailEnd of the deletion should Begin of the insertiondisable "on submit"End of the insertion Begin of the deletion have been sent to that userEnd of the deletion


### Begin of the insertion

End of the insertion Begin of the deletion Important note

_Please note that unless you are a contributor to OpenProject, you can no longer edit this bug report after saving. You can still add new comments, new images and upload attachments though, but updating description or modifying fields will not be possible after saving. Please make sure that all necessary information and attachments are added, and the following attributes are set:_

End of the deletion ### Begin of the deletion **Logs**

_Are there errors in the browser console? (_[_Click here for information on how to open your browser's console_](https://webmasters.stackexchange.com/a/77337)_) For a local installation: Are there relevant logs output by_ `_openproject logs_` _(packaged installation) (_[_click here for details_](https://docs.openproject.org/installation-and-operations/operation/monitoring/#show-logs)_) or in a log/production.log or /var/log/openproject/ ? Please attach error output in these log files if applicable_

###End of the deletion Screenshots and other files

<br>

<img class="op-uc-image op-uc-image_inline" Begin of the insertionsrc="/api/v3/attachments/269279/content">End of the insertion Begin of the deletion src="/api/v3/attachments/267840/content">End of the deletion

**OpenProject version**

_15.2.x_ Begin of the deletion

**Browser**

* [ ] Chrome
* [ ] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Operating System**

* [ ] Windows
* [ ] Mac OS X
* [ ] Mobile iOS
* [ ] Mobile Android
* [ ] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)End of the deletion