it happens that blender grease pencil crashes regularly, when I'm in drawing modus and press:
l (L Key) - then cmd+z
Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Short description of error
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).