Rhino Chrash when deleting breps

Using Rhino 6 on Win10.
When i have grasshopper running (calculating my squaremeters) and delete some of the breps i have assigned to calculate, Rhino have now twice chrashed seemingly unmotivated but under similar actions - Deleting some levels from my file. I have attached a screenshot of the sutiation when it chrashed. The file is gone. It chrashes so hard that it do not even make a chrashdump.