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-rw-r--r--diff-lib.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/diff-lib.c b/diff-lib.c
index 2e09500c82..b3797592c6 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -379,7 +379,8 @@ static void do_oneway_diff(struct unpack_trees_options *o,
if (cached && idx && ce_stage(idx)) {
struct diff_filepair *pair;
pair = diff_unmerge(&revs->diffopt, idx->name);
- fill_filespec(pair->one, idx->sha1, idx->ce_mode);
+ if (tree)
+ fill_filespec(pair->one, tree->sha1, tree->ce_mode);
return;
}