Cannot read property type of undefined

[dhruvp]

Hi!

First of all thank you so much for creating and maintaining annotorious for the broader public. It has been a joy to use and has made our lives so much better!

One issue we've been seeing every so often is when we hit edit on an annotation, we get a javascript error in annotorious:

Uncaught TypeError: Cannot read property 'type' of undefined
    at http://127.0.0.1:8080/js/annotorious.min.js:215:107
    at Da (http://127.0.0.1:8080/js/annotorious.min.js:7:92)

I've done my best at understanding why that happens and it seems to me that it corresponds to the code here:

https://github.com/annotorious/annotorious/blob/b3a1db3bf21abccd8b44b3e0c6c2b6479b11b1a9/src/mediatypes/image/image.viewer.js#L245-L248

What's happening is shape is a null object as passed in. This happens because the given shape is for some reason not in self._shapes as in this code snippet:

      self._draw(self._shapes[annotorious.shape.hashCode(annotation.shapes[0])]);

This seems to happen somewhat randomly - most annotations in the same image work but the odd annotation will cause this error.

Would you please be able to help us debug this?

Thank you!

Dhruv