Index: binaries/data/mods/public/simulation/components/Barter.js
===================================================================
--- binaries/data/mods/public/simulation/components/Barter.js
+++ binaries/data/mods/public/simulation/components/Barter.js
@@ -39,11 +39,13 @@
 	var prices = { "buy": {}, "sell": {} };
 	let cmpPlayer = Engine.QueryInterface(playerEntity, IID_Player);
 	let multiplier = cmpPlayer.GetBarterMultiplier();
+	if (!multiplier)
+		multiplier = clone(prices);
 	for (let resource of Resources.GetCodes())
 	{
 		let truePrice = Resources.GetResource(resource).truePrice;
-		prices.buy[resource] = truePrice * (100 + this.CONSTANT_DIFFERENCE + this.priceDifferences[resource]) * multiplier.buy[resource] / 100;
-		prices.sell[resource] = truePrice * (100 - this.CONSTANT_DIFFERENCE + this.priceDifferences[resource]) * multiplier.sell[resource] / 100;
+		prices.buy[resource] = truePrice * (100 + this.CONSTANT_DIFFERENCE + this.priceDifferences[resource]) * (multiplier.buy[resource] || 1.0) / 100;
+		prices.sell[resource] = truePrice * (100 - this.CONSTANT_DIFFERENCE + this.priceDifferences[resource]) * (multiplier.sell[resource] || 1.0) / 100;
 	}
 	return prices;
 };
Index: binaries/data/mods/public/simulation/components/Player.js
===================================================================
--- binaries/data/mods/public/simulation/components/Player.js
+++ binaries/data/mods/public/simulation/components/Player.js
@@ -1,25 +1,33 @@
 function Player() {}
 
 Player.prototype.Schema =
-	"<element name='BarterMultiplier' a:help='Multipliers for barter prices.'>" +
-		"<interleave>" +
-			"<element name='Buy' a:help='Multipliers for the buy prices.'>" +
-				Resources.BuildSchema("positiveDecimal") +
-			"</element>" +
-			"<element name='Sell' a:help='Multipliers for the sell prices.'>" +
-				Resources.BuildSchema("positiveDecimal") +
-			"</element>" +
-		"</interleave>" +
-	"</element>" +
-	"<element name='SharedLosTech' a:help='Allies will share los when this technology is researched. Leave empty to never share LOS.'>" +
-		"<text/>" +
-	"</element>" +
-	"<element name='SharedDropsitesTech' a:help='Allies will share dropsites when this technology is researched. Leave empty to never share dropsites.'>" +
-		"<text/>" +
-	"</element>" +
-	"<element name='SpyCostMultiplier'>" +
-		"<ref name='nonNegativeDecimal'/>" +
-	"</element>";
+	"<optional>" +
+		"<element name='BarterMultiplier' a:help='Multipliers for barter prices.'>" +
+			"<interleave>" +
+				"<element name='Buy' a:help='Multipliers for the buy prices.'>" +
+					Resources.BuildSchema("positiveDecimal") +
+				"</element>" +
+				"<element name='Sell' a:help='Multipliers for the sell prices.'>" +
+					Resources.BuildSchema("positiveDecimal") +
+				"</element>" +
+			"</interleave>" +
+		"</element>" +
+	"</optional>" +
+	"<optional>" +
+		"<element name='SharedLosTech' a:help='Allies will share los when this technology is researched. Leave empty to never share LOS.'>" +
+			"<text/>" +
+		"</element>" +
+	"</optional>" +
+	"<optional>" +
+		"<element name='SharedDropsitesTech' a:help='Allies will share dropsites when this technology is researched. Leave empty to never share dropsites.'>" +
+			"<text/>" +
+		"</element>" +
+	"</optional>" +
+	"<optional>" +
+		"<element name='SpyCostMultiplier'>" +
+			"<ref name='nonNegativeDecimal'/>" +
+		"</element>" +
+	"</optional>";
 
 /**
  * Which units will be shown with special icons at the top.
@@ -56,11 +64,11 @@
 	this.disabledTemplates = {};
 	this.disabledTechnologies = {};
 	this.startingTechnologies = [];
-	this.spyCostMultiplier = +this.template.SpyCostMultiplier;
-	this.barterMultiplier = {
+	this.spyCostMultiplier = this.template && this.template.SpyCostMultiplier ? +(this.template.SpyCostMultiplier) : undefined;
+	this.barterMultiplier = this.template && this.template.BarterMultiplier ? {
 		"buy": clone(this.template.BarterMultiplier.Buy),
 		"sell": clone(this.template.BarterMultiplier.Sell)
-	};
+	} : undefined;
 
 	// Initial resources and trading goods probability in steps of 5
 	let resCodes = Resources.GetCodes();
@@ -535,7 +543,7 @@
 	if (!cmpRangeManager || !cmpTechnologyManager)
 		return;
 
-	if (!cmpTechnologyManager.IsTechnologyResearched(this.template.SharedLosTech))
+	if (this.template && this.template.SharedLosTech && !cmpTechnologyManager.IsTechnologyResearched(this.template.SharedLosTech))
 	{
 		cmpRangeManager.SetSharedLos(this.playerID, [this.playerID]);
 		return;
@@ -576,6 +584,8 @@
 
 Player.prototype.HasSharedLos = function()
 {
+	if (!this.template || !this.template.SharedLosTech)
+		return false;
 	let cmpTechnologyManager = Engine.QueryInterface(this.entity, IID_TechnologyManager);
 	return cmpTechnologyManager && cmpTechnologyManager.IsTechnologyResearched(this.template.SharedLosTech);
 };
@@ -746,6 +756,9 @@
 
 Player.prototype.OnResearchFinished = function(msg)
 {
+	if (!this.template)
+		return;
+
 	if (msg.tech == this.template.SharedLosTech)
 		this.UpdateSharedLos();
 	else if (msg.tech == this.template.SharedDropsitesTech)
Index: binaries/data/mods/public/simulation/templates/special/player_gaia.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/special/player_gaia.xml
+++ binaries/data/mods/public/simulation/templates/special/player_gaia.xml
@@ -1,22 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Entity>
-  <Player>
-    <SharedLosTech/>
-    <SharedDropsitesTech/>
-    <SpyCostMultiplier>1.0</SpyCostMultiplier>
-    <BarterMultiplier>
-      <Buy>
-        <food>1.0</food>
-        <wood>1.0</wood>
-        <stone>1.0</stone>
-        <metal>1.0</metal>
-      </Buy>
-      <Sell>
-        <food>1.0</food>
-        <wood>1.0</wood>
-        <stone>1.0</stone>
-        <metal>1.0</metal>
-      </Sell>
-    </BarterMultiplier>
-  </Player>
+<Entity filtered="" parent="special/player">
+  <Player replace=""/>
 </Entity>