--- pgpewrap.c | 5 +++++ 1 file changed, 5 insertions(+) --- pgpewrap.c +++ pgpewrap.c 2019-11-13 13:00:01.256398592 +0000 @@ -57,6 +57,11 @@ int main(int argc, char **argv) } *opt = NULL; + if (opts[0] == NULL) + { + fprintf(stderr, "Command line usage: %s [flags] -- prefix [recipients]\n", argv[0]); + return 1; + } execvp(opts[0], opts); perror(argv[0]); return 2;