SCM Example Fails in CI

[billdenney]

The following error intermittently comes up in CI (I cannot replicate it locally):

Error in rxState(x) : 
    Evaluation error: Evaluation error: INTEGER() can only be applied to a 'integer', not a 'NULL'..
  [1] "error fitting the model for the covariate "
  <simpleError: Evaluation error: Evaluation error: INTEGER() can only be applied to a 'integer', not a 'NULL'..>
  Error in if (dObjf < 0) { : argument is of length zero

The problem R code appears to be here, but the underlying issue appears to be an issue on the C side:

nlmixr2extra/R/SCM.R

Lines 277 to 284 in c13dc98

	dObjf <- fit$objf - x$objf
	dof <- length(x$finalUiEnv$ini$est) - length(fit$finalUiEnv$ini$est)
	if (dObjf < 0) {
	pchisqr <- 1 - pchisq(-dObjf, df = dof)
	}
	else {
	pchisqr <- 1
	}

@mattfidler, any ideas?

[mattfidler]

Nope. Not to why.

But my guess is if we run this sort of like ShinyMixR in a separate R session it may alleviate this problem.