Adding new content to diagrams is failing on drakonhub

[bigale]

This is a critical bug that seems to just start happening recently.

It seems like you can add maybe one process box to a diagram and then adding more or copying and pasting causes error.

Steps: Load diagram and try to add element e.g. https://drakonhub.com/ide/doc/verylargeal/8

Expected Result: Element is added to canvas Actual Result: Error message page is displayed Something did not work somewhere

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[adva-cg]

У меня аналогичные ошибки появились

[kirillportfolio]

the same