gitweb: minimally fix "fork" support.

diff --git a/builtin-log.c b/builtin-log.c
index fc5e47606c65962a7a1c1ab37a77f21f185a3bd5..fedb0137bc5e3ba50ecb90ce560ce9ce9290d8df 100644 (file)
--- 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);
 }