bl_info = {
    "name": "Hotkey Crash Test",
    "author": "Demeter Dzadik",
    "version": (1, 0),
    "blender": (2, 80, 0),
    "location": "blender",
    "description": "Trying to access KeyMapItem.properties on register causes a crash",
    "category": "System",
}

import bpy

def register():
    print("Registering hotkey crash test...")
    for km in bpy.context.window_manager.keyconfigs.user.keymaps:
        print(km.name)
        for kmi in km.keymap_items:
            print(kmi.name, kmi.idname)
            if kmi.properties:
                pass

def unregister():
    pass