Internal server error on adding a new location

Summary

Adding a location with an email address that doesn't yet exist causes internal server error

Steps to reproduce

1. Click on the map at any free location
2. Click add location
3. Fill in the input fields with valid random values
4. Click Save
5. Dialog reporting "internal server error" appears

What is the current bug behavior?

When adding a location with an email address that doesn't yet exist, the frontend reports internal server error despite the new marker appearing on the mapp

What is the expected correct behavior?

An "internal server error" shouldn't happen

Relevant logs and/or screenshots

Possible fixes

N/A