Homemade Sauerkraut is very healthy for you and is usually much healthier than store bought sauerkraut.
But yes homemade sauerkraut can make you sick if you do not ferment the homemade sauerkraut correctly.
When fermenting homemade sauerkraut you need to make sure that no oxygen gets to the sauerkraut when making it to prevent bacteria from growing in it.
Make sure you use an airtight container and keep it sealed while the homemade sauerkraut is fermenting.
If you notice any browned cabbage, a yeasty odor, slime, or mold then it's likely that your fermenting container is not airtight and the homemade sauerkraut is going bad and should be thrown out.
As long as you make the sauerkraut problem then it should not make you sick and it should actually help improve your health.
I've never gotten sick from eating any homemade sauerkraut but if you do not make it properly then you could become sick.