Apex domains cannot have CNAME records.
Question and response
Question
dig crusher-machine.org. NS
Answer
crusher-machine.org. 5 NS ns-639.awsdns-15.net.
crusher-machine.org. 5 NS ns-1523.awsdns-62.org.
crusher-machine.org. 5 NS ns-1553.awsdns-02.co.uk.
crusher-machine.org. 5 NS ns-311.awsdns-38.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0