Uncaught TypeError: Cannot read property 'weight' of undefined

This repo looks super-interesting, but for some reason I'm getting the same error on all examples:

127.0.0.1/:397 Uncaught TypeError: Cannot read property 'weight' of undefined

I get the error twice per example. It apparently happens at line 397, which is copied below.

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mbojan / d3net

Uncaught TypeError: Cannot read property 'weight' of undefined #20