JETI exception while processing an incoming email

Question

I get the below message when I try to configure Email This Issue Mail Handler for a project/issue type combination for which I've defined a mail handler. What could be the cause of this error? What am I doing wrong?

JIRA 6 / JETI 5.4.1

Exception: key should not be null!: key should not be null!

Sergey Egorov · Answer

+1 - we have the same issue.

Perfect error reporting! :-/

Juan P Gomez · Answer

In our company we are having the same issue.

2015-09-22 15:31:01,537 atlassian-scheduler-quartz1.clustered_Worker-2 ERROR anonymous    ECS Mail Handler [atlassian.mail.incoming.mailfetcherservice] ECS Mail Handler[10040]: Exception: key should not be null!
com.atlassian.jira.util.dbc.Assertions$NullArgumentException: key should not be null!
        at com.atlassian.jira.util.dbc.Assertions.notNull(Assertions.java:29)

Have you been able to fix the error?
JIRA 6.4.8 / JETI 6.3.0.2