At this time (10/1/2017), the bug has been patched, but the patched version is not on CRAN yet. I expect the patched version to be on CRAN within a week.
In the meantime...how do you get valid inference? The safest thing to do is to replace your NA's with Inf's. In otherwords, if your variable u is the upper end of your response variable in your data, simply apply
data$u[is.na(data$u)] = Inf
Alternatively, you don't want to edit your own code, you can install the patched version of icenReg from gitHub. To do this, call
I apologize for the error.
icenReg v2.0.4 is now on CRAN, in which this error was fixed.