RFC 2516, "A Method for Transmitting PPP Over Ethernet (PPPoE)", February 1999

Errata ID: 5635
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Chris Fletcher
Date Reported: 2019-02-11

Section Appendix A says:

If there is data, and the first octet of the data is nonzero, then
it MUST be a printable UTF-8 string which explains the nature of
the error.  This string MAY NOT be NULL terminated.

It should say:

If there is data, and the first octet of the data is nonzero, then
it MUST be a printable UTF-8 string which explains the nature of
the error.  This string MUST NOT be NULL terminated.

Notes:

Keyword "MAY NOT" should be "MUST NOT" to comply with RFC 2119.

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