[openstreetmap/openstreetmap-website] Web app crashes on saving (#2252)

[Sidati MESSAITI]

Hi,
After doing some edits on my neighborhood 😎, clicking **Save** (Ctrl+S) the app crashes and screenshot the error on my console log : 

![image](https://user-images.githubusercontent.com/4185345/59008066-b3e17280-8818-11e9-964c-626194cbecf7.png)

Hope you fix it so i can save my edits :)
Thanks in advance ;)

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