Elements get deleted when Blocks update

When I update blocks through the Block Editor sometimes it happens that the entire file disappears/gets deleted.
Any fixing for this?
I´m running Version 6
(6.4.18130.19341, 10-05-2018)

6.5 fixed a problem where everything would be deleted after a BlockEdit (RH-45362).
Could you please try the Release Candidate and report back?

Downloaded just now the RC. Will try immediatley and then report back to you! thanks again wim!

Problem fixed. Thanks :slight_smile: