Error raised when one of the columns of the target matrix Y is constant

[camilaagw]

When one of the columns of the target matrix Y is constant the following error is raised both for plsca and plsreg2 :

Error in if (ah.dif < 1e-06 || iter == 100) break : 
  missing value where TRUE/FALSE needed

The following code snippet will allow to reproduce this:

data(linnerud)
X = linnerud[4:6]
Y = linnerud[1:3]
Y[,2] = 1
plsreg2(X, Y)
plsca(X, Y)

Is this behaviour expected?