lsp-ui-sideline errors out when in a buffer not backed by a file

[Fuco1]

I check out a previous revision of a file with magit, that creates a file such as foobar.txt~hash~ in which buffer-file-name is nil. Then something calls file-truename on this and it breaks.

Debugger entered--Lisp error: (wrong-type-argument arrayp nil)
  file-truename(nil)
  lsp-ui-sideline--run()
  apply(lsp-ui-sideline--run nil)
  timer-event-handler([t 0 0 200000 nil lsp-ui-sideline--run nil idle 0])

[sebastiencs]

Thanks, it should be fixed in a5e559e