First of all, Thanks for your great application.
I have multiple projects.
Other projects are all fines, but tasks in a single project cannot be marked as done.
Whenever I click the mark as done button, task page change to blank task with numbering #0.
I already try in demo, but I cannot reproduce the error.
Even restart vikunja, postgres linked to it not worked.
Is there any possible reason and way to resolve it?