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-rw-r--r--builtin/commit-graph.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index 988445abdf..78fa08f43a 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -128,6 +128,8 @@ static int write_option_parse_split(const struct option *opt, const char *arg,
{
enum commit_graph_split_flags *flags = opt->value;
+ BUG_ON_OPT_NEG(unset);
+
opts.split = 1;
if (!arg)
return 0;