2018, didn't file NY return, W2 Box 15/16 had NJ and NY wages. Small amount of NY taxes were withheld for only one pay period, my error. What to do now to resolve this?

My first pay stub had NY address due to an error. Thus W2 showed wages in both the states. As NY tax paid was very little, I didn't file NY return and only filed NJ return. Now NY is not only taxing me twice but tacking interest and penalty.