From 85c7cce7405f83c3d71f8acc13bd43abaf42cc36 Mon Sep 17 00:00:00 2001
From: Cooldude2606 <25043174+Cooldude2606@users.noreply.github.com>
Date: Mon, 1 Sep 2025 19:29:17 +0100
Subject: [PATCH] Fix uninitialised data in research milestones

Fixes: #407
---
 exp_scenario/module/gui/research_milestones.lua | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/exp_scenario/module/gui/research_milestones.lua b/exp_scenario/module/gui/research_milestones.lua
index 5f5a050b..4f6d9f19 100644
--- a/exp_scenario/module/gui/research_milestones.lua
+++ b/exp_scenario/module/gui/research_milestones.lua
@@ -267,6 +267,9 @@ Elements.container = Gui.define("research_milestones/container")
         local milestone_table = Elements.milestone_table(container)
         Elements.clock_label(header)
 
+        local force = Gui.get_player(parent).force
+        def.data[force] = def.data[force] or {} -- used by start index and row data
+
         local force = Gui.get_player(parent).force --[[ @as LuaForce ]]
         local start_index = Elements.container.calculate_starting_research_index(force)
         for research_index = start_index, start_index + display_size - 1 do
@@ -276,7 +279,6 @@ Elements.container = Gui.define("research_milestones/container")
 
         return Gui.elements.container.get_root_element(container)
     end)
-    :force_data{} --[[ @as any ]]
 
 --- Set the achieved time for a force
 --- @param force LuaForce