Creating a new Сanvas leads to an error "Failed to load ".../Untitled.Canvas" Unexpected end of JSON input"

What I’m trying to do

When I am trying to create a new Canvas I get an error “Failed to load “…/Untitled.Canvas” Unexpected end of JSON input”. Old Canvases created before are working just fine.
Thank you in advance!

It is a firewall TinyFirewall blocking the “Advanced Canvas plugin” or something like that.

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