diff -Nrup a/src/completion.c b/src/completion.c
--- a/src/completion.c 2013-10-04 08:09:08.000000000 -0600
+++ b/src/completion.c 2019-12-17 13:11:47.372648663 -0700
@@ -484,7 +484,7 @@ char **tokenize(const char *command_line
error:
argv_free(argv);
- zfree(shell);
+ zfree(*shell);
return NULL;
}