If you're using the iNotes Extension database (usually forms85_x.nsf) to extend iNotes, and using a 'nonce' (not to be confused with the slang term), you might be interested to know that between 8.5.2 & 8.5.3 the syntax changed.
If you couldn't understand why the call fails with 8.5.3, and you found this post via web search, hopefully it will help.
AAA.HHT ? AAA.HHT() : AAA.getNonce();
and it should be fine.