This fixes an invalid assumption in commit_path_changed_in_worktree();
namely, that we always have a parent commit.

diff /home/mark/src/got
commit - 22d6be814cfc21a663987c0dcb547f99e48a9860
path + /home/mark/src/got
blob - 326ea521fa760c8c7507f7ebcb14de2cc202defc
file + got/got.c
--- got/got.c
+++ got/got.c
@@ -8418,21 +8418,22 @@ commit_path_changed_in_worktree(int *add_logmsg, struc
 		goto done;
 
 	pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
+	if (pid != NULL) {
+		err = got_object_open_as_commit(&pcommit, repo, &pid->id);
+		if (err)
+			goto done;
 
-	err = got_object_open_as_commit(&pcommit, repo, &pid->id);
-	if (err)
-		goto done;
+		err = got_object_open_as_tree(&tree, repo,
+		    got_object_commit_get_tree_id(commit));
+		if (err)
+			goto done;
 
-	err = got_object_open_as_tree(&tree, repo,
-	    got_object_commit_get_tree_id(commit));
-	if (err)
-		goto done;
+		err = got_object_open_as_tree(&ptree, repo,
+		    got_object_commit_get_tree_id(pcommit));
+		if (err)
+			goto done;
+	}
 
-	err = got_object_open_as_tree(&ptree, repo,
-	    got_object_commit_get_tree_id(pcommit));
-	if (err)
-		goto done;
-
 	err = got_diff_tree(ptree, tree, NULL, NULL, -1, -1, "", "", repo,
 	    got_diff_tree_collect_changed_paths, &paths, 0);
 	if (err)

-- 
Mark Jamsek <fnc.bsdbox.org>
GPG: F2FF 13DE 6A06 C471 CA80  E6E2 2930 DC66 86EE CF68