Am 23.09.2019 um 10:57 schrieb Alecos Papadopoulos: Yes, you're doing it wrong, but of course that should only cause an error message, not a gretl crash. So that is a bug (if it's a current gretl version). Apart from that, 'break' is not an interactive command - actually there are no interactive commands in gretl AFAIK. Once a script is running, it's running, and the only legal way to stop it is to press the red button (in the GUI). So 'break' is an algorithmic script command, like this: <hansl> strings as = defarray("where", "is", "the", "first", "the", "?") loop i = 1..nelem(as)     if as[i] == "the"         print "found it!"         break     endif endloop </hansl> hth, sven