Ruby on Rails

Just another quick question if you don't mind.

I'm trying to manually append a SafetyOfficer to the Timesheet with the
Rails console:

Incident.first.timesheet.safety_officer << SafetyOfficer.last

NoMethodError: You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.<<

I searching for a solution but can't find anything. Do you know what
this error message means? All the fields in SafetyOfficer.last are
correct, and 'timesheet_id' is nil.

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