Do I need to file a NJ non-resident return if live in Maine but work for a company in NJ on the side?

I live and work in Maine.  I have a side job with a company in NJ and receive a W-2 with 'NJ' and wage amount in boxes 15 and 16.  I have no NJ state tax withheld.  I do not physically travel to NJ to do any work.  Do I need to file a NJ non-resident return? 

 

In recent years, I've played it safe and filed a non-resident return and took the credit on Maine return.  Do I stick with the conservative approach or just scrap the NJ NR return altogether?

 

Thank you.