Hi, not sure if this is an unknown bug or expected behavior, but it seems like the inspector crashes without a descriptive error and crashes quite severely at that, when even one material has no name.
See this playground for an example: Babylon.js Playground
If you click on the materials tab you will see tons of red error messages in the console and bit by bit the inspector will start to fall apart, seemingly because the standard material has no name.
This one had me stumped for a while, and pretty much only found what was crashing my scene by replacing the es6 babylon example bit by bit until it crashed