showmsg causes assertion failure

Created by: subhacom

The showmsg command on a newly created object causes assertion failure. An example session:

moose #1 (closed) > create compartment /c moose #2 (closed) > showmsg /c INCOMING MESSAGES onto /c moose: SimpleElement.cpp:196: virtual const Msg* SimpleElement::msg(unsigned int) const: Assertion `msgNum < msg_.size()' failed. Aborted (core dumped)

Reported by: subhacom