Crash when dragging up and down

[ghost]

When I drag an item from it's original location to a location above the TableView, and immediately after that to a location below the TableView, an assertion failure occurs:

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid     
update: invalid number of rows in section 0.  The number of rows contained in an existing section after 
the update (5) must be equal to the number of rows contained in that section before the update (5), 
plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus 
or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'

See this GIF, the first drag doesn't crash it but the second faster one does.