Urgent ! Is there a way to restore a previous version ?

I was working on a Prezi on my tablet, then closed it for a moment without logging out, and when I came back, for some reason, I suddenly got a message in the prezi that an error has occurred. Then I decided to close the page, and to refresh, but when I tried to get back to it, everything, all the contents and the efforts we had put in, just disappeared... Only some random arrows were randomly left... That happened just 2 or 3 hours ago.

It is an important work, we didn't think of having a back-up previously, so is there any way to restore the work that has been done ?

Here's the link to the now-empty page .... https://prezi.com/6r38atw_o7tp/untitled-prezi/

Thank you in advance