Fix arg validation minor unexpected error - For some reason in R 4.x class() of a matrix returns a vector   of length > 1, so the if() statement wasn't evaluating
Fix arg validation minor unexpected error
- For some reason in R 4.x class() of a matrix returns a vector
  of length > 1, so the if() statement wasn't evaluating

nsh87/receptormarker,nsh87/receptormarker,nsh87/receptormarker,nsh87/receptormarker,nsh87/receptormarker