Upgrading from OpenAM 13.5.0 to AM 184.108.40.206 with custom PAPs fails with a Null Pointer Exception, see the attached amUpgrade log for the exact error and stack traces.
The PAP classes must be present in a chain and the war file to be used for upgrading. Please see the support ticket referenced in the support section of this JIRA for the exact steps to reproduce.
Remove custom PAPs, upgrade then add them back. This is fine if you only have a couple of upgrades to do, if you have 100's of servers this is far too much work.
OPTIONAL - If you already investigated the code, please share your finding here (remove this text)