Events via Node-Red show (parse?) error from RM

I'm collecting temperature data from various sensors via Node-Red. The debug window in Node-Red shows some what appears to be parsing errors when RM runs a simple Rule.

I'm thinking it might be just some parsing error, however if there is more lurking I would like to understand it.

Any suggestions would be welcome.

John

Error:

Node-Red Flow:

This appears to be the offending rule: