Error in convertToMinimization helpful?

[surmann]

MWE:

packageVersion("smoof")
#[1] ‘1.5.1’
convertToMinimization(makeAlpine01Function(1))
#Error in convertProblemDirection(fn, minimize.after = TRUE) : Function should already be minimized.

Is it helpful to generate an error when using convertToMinimization on a function that is already minimised? I use this function in general on a bunch of test functions and get this error.
I'm aware of shouldBeMinimized but this makes my if-clause more complex.

I think convertToMinimization() should just return the function, if it is already to be minimised.