Saving scene with undefined name cause 504 gateway time-out

[Jlu18]

After the update (or maybe before the update), some of my scene were not displayed in the project view and find out those project that are not displayed in the scene has a undefined value for their title.
Also trying to save the scene, it pause the for few seconds than returns 504 so something is happening in the backend server.

Some examples are
https://learnmyr.org/scene/60ef92c1621a970012978b9b
https://learnmyr.org/scene/618d660c2b816f001894bc83

I'm not sure what's happening in the backend but it looks like some of data are messed up.

[Jlu18]

It looks like invalid scene only contains scene id and code.

Invalid

Valid