Created attachment 175589 [details] origin file to reproduce the crash - take the attached Origin file and try to open it with LabPlot by double-clicking on the file in the Windows file explorer result: crash and Windows steps in to kill LabPlot
The situation is different if you - open LabPlot - create a new file - drag in the attached file result: LabPlot seems to be trapped in an endless loop, after some times Windows steps in and close LabPlot because it is no longer responsive to Windows
Created attachment 175590 [details] another Origin file that also triggers the crash
The two projects revealed two independent crashes which are now fixed in master.