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-rw-r--r--builtin/env--helper.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/builtin/env--helper.c b/builtin/env--helper.c
index 3aa4282114..27349098b0 100644
--- a/builtin/env--helper.c
+++ b/builtin/env--helper.c
@@ -17,6 +17,8 @@ static int option_parse_type(const struct option *opt, const char *arg,
{
enum cmdmode *cmdmode = opt->value;
+ BUG_ON_OPT_NEG(unset);
+
if (!strcmp(arg, "bool"))
*cmdmode = ENV_HELPER_TYPE_BOOL;
else if (!strcmp(arg, "ulong"))