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-rw-r--r--shared.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/shared.c b/shared.c
index c7cd8a5..f20fb5c 100644
--- a/shared.c
+++ b/shared.c
@@ -360,7 +360,7 @@ void cgit_diff_tree(const unsigned char *old_sha1,
opt.format_callback_data = fn;
diff_setup_done(&opt);
- if (old_sha1)
+ if (old_sha1 && !is_null_sha1(old_sha1))
ret = diff_tree_sha1(old_sha1, new_sha1, "", &opt);
else
ret = diff_root_tree_sha1(new_sha1, "", &opt);