Error Spectrum1D object creation (ufunc 'isnan' not supported for the input types)

Dear Community,
I'm trying to create a Spectrum1D object from a MUSE datacube (after suming over the two spatial dimensions) through
`lamb = lambdas`
`flux = sp1`
`spec = Spectrum1D(spectral_axis=lamb, flux=flux) `

However, I´me getting this error, when I've checked that sp1 `(sp1 = cube.sum(axis=(1,2)))` is a numpy array with no NaNs.

`TypeError: ufunc 'isnan' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''`

Kind Rgds
Jose

Start by reproducing the `Spectrum1D(spectral_axis=lamb, flux=flux)` call using the MUSE-derived arrays and inspect the types of both inputs, especially `lambdas` and `sp1`. No repository file or test is named; done should identify the incompatible input and establish a reproducible test or clear supported-input behavior.

Written by the indexing model from the issue text.