Try to square an expression that evaluates to zero, in the most simple case (0)^2. The result should be well defined (=0), but SpeedCrunch 0.12 returns NaN.
The original expression where I encountered this error was sqrt(((0*pi/(96e-3))^2)) which results in "undefined argument domain". It would be helpful if NaN would appear there somewhere since this error was kind of misleading. Thanks