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-rw-r--r--builtin-log.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/builtin-log.c b/builtin-log.c
index fc5e47606c..fedb0137bc 100644
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -171,8 +171,11 @@ static void reopen_stdout(struct commit *commit, int nr, int keep_subject)
static int get_patch_id(struct commit *commit, struct diff_options *options,
unsigned char *sha1)
{
- diff_tree_sha1(commit->parents->item->object.sha1, commit->object.sha1,
- "", options);
+ if (commit->parents)
+ diff_tree_sha1(commit->parents->item->object.sha1,
+ commit->object.sha1, "", options);
+ else
+ diff_root_tree_sha1(commit->object.sha1, "", options);
diffcore_std(options);
return diff_flush_patch_id(options, sha1);
}