"dispparam" for "gaussian" family is empty

[ch16S]

The main stackedsdm function calls the gaussian distribution dispersion parameter as follows:
out_params$dispparam <- summary(fit_init)$sigma^2
But using the $sigma does not called the std error column of the lm and thus returns an empty list value.

This needs to be adjusted to something such as:
out_params$dispparam <- summary(fit_init)$coefficients[1,2]

Cheers
Chris