Yes, but I think it was already sick at that point. Once it gets sick... It really doesn't matter what you type in. It is possible that 'n' is a bad choice and that should be changed to some other letter.

This is a cut & paste from my PronterFace:

>>>G29 n2
SENDING:G29 n2
Eqn coefficients: a: -0.00 b: 0.02 d: 4.11
planeNormal x: 0.00 y: -0.02 z: 1.00

It echos a lower case n and not an upper case N.