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-rw-r--r--diff-lib.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/diff-lib.c b/diff-lib.c
index a9f38eb5a3..732f684a49 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -520,6 +520,9 @@ int run_diff_index(struct rev_info *revs, int cached)
struct object_array_entry *ent;
uint64_t start = getnanotime();
+ if (revs->pending.nr != 1)
+ BUG("run_diff_index must be passed exactly one tree");
+
ent = revs->pending.objects;
if (diff_cache(revs, &ent->item->oid, ent->name, cached))
exit(128);