Hello again,
A known cause of this issue is SimConnect queries for missions/flightplans without origin and/or destination airports, independant of the source of the file.
We are aware that this query it is being performed by Little Nav Map, triggering the issue. Other external add-ons interacting with the flight plan could also trigger it.
Until the fix is present in the live version, you might have to refrain from external add-ons interacting with the flight plan.
Once again, we apologize for the inconvenience.
Engine Programmer / Asobo