Whole Inventory clear bug!

I found a bug which clears the whole Inventory of a Player. I connected to Server during a massive Server Lag (60s tick) the Server was emergency saving but when I restarted My Inventory was cleared and only mine, the Inventory of the others, that had been on the Server was still there. I think the Problem was, that the Server was saving. Maybe cache the Files while the Server is saving so these Bugs can't happen.