Ticket #4269: 4269_fix.patch

binaries/data/mods/public/gui/session/session.js

@@ -897 +897 @@
     let getCostSum = (template) =>
     {
         let cost = GetTemplateData(template).cost;
-        return Object.keys(cost).map(key => cost[key]).reduce((sum, cur) => sum + cur);
+        return cost ? Object.keys(cost).map(key => cost[key]).reduce((sum, cur) => sum + cur) : 0;
     };
 
     for (let i in Engine.GetGUIObjectByName("unitGroupPanel").children)