I am weighing in even though I know nothing.
in tryCatch define an error handler
error = function(e){
text <- print(e) # surely there must be better ways
# parse text for substring 'optim' or more strongly characteristic
substrings
# you have already seen to emerge from optim
# do what you have to do if such is detected
}
Sorry if this answer seems trivial.
Michael Meyer
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