Problem with column names starting with 'X' followed by a number

[piplus2]

M3C/R/M3C.R

Line 115 in 8d975f2

if (is(mydata,"matrix")){

In this line the 'X' is removed from the column names. If the following character is a number, then the 'X' will be added again when the matrix is converted into a data.frame. This gives an error in the neworder1, neworder2.

[jgarces02]

https://stackoverflow.com/questions/65010759/clustering-by-m3c-package-error-in-data-framedf-neworder2-undefined-c