Don't try to change immutable 'options' object.

1 files changed, 2 insertions, 0 deletions

diff --git a/rules.js b/rules.js
index 4376f88..0fda774 100644
--- a/rules.js
+++ b/rules.js
@@ -9436,6 +9436,8 @@ function setup_1755(end_year) {
 }
 
 exports.setup = function (seed, scenario, options) {
+	options = object_copy(options)
+
 	load_game_state({
 		seed: seed,
 		options: options,