Had this pop up on a document today. Any idea what that is, @mikeday?

A bug! Were there any other errors? Can you reproduce it with latest builds?

No other errors, and a couple dozen warnings. I'll check latest build and get back to you.

Latest build produced "prince: internal error: ref_already_used(ref(45))", so whatever it is still happens in latest. I'll try to get permission from the customer to share with you.

@mikeday, Care if I email you the input for this one to have a look? Or do you already know what it is?

The input would be very helpful, yes.

This issue appears to be related to SVG images that have overlapping references, or something. Mike, I'll send you the code.

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We have now released Prince 11.4 with a fix for this issue. Thanks for letting us know!