diff --git a/binaries/data/mods/public/simulation/ai/petra/headquarters.js b/binaries/data/mods/public/simulation/ai/petra/headquarters.js
index dd8947e34c..5bf598789d 100644
--- a/binaries/data/mods/public/simulation/ai/petra/headquarters.js
+++ b/binaries/data/mods/public/simulation/ai/petra/headquarters.js
@@ -102,9 +102,9 @@ m.HQ.prototype.init = function(gameState, queues, deserialization)
 	if (this.Config.difficulty == 0)
 		this.targetNumWorkers = Math.max(1, Math.min(40, Math.floor(gameState.getPopulationMax())));
 	else if (this.Config.difficulty == 1)
-		this.targetNumWorkers = Math.max(1, Math.min(60, Math.floor(gameState.getPopulationMax())));
+		this.targetNumWorkers = Math.max(1, Math.min(60, Math.floor(gameState.getPopulationMax()/2)));
 	else
-		this.targetNumWorkers = Math.max(1, Math.min(120,Math.floor(gameState.getPopulationMax()/3.0)));
+		this.targetNumWorkers = Math.max(1, Math.min(120,Math.floor(gameState.getPopulationMax()/3)));
 
 	this.treasures = gameState.getEntities().filter(function (ent) {
 		var type = ent.resourceSupplyType();
diff --git a/binaries/data/mods/public/simulation/ai/petra/navalManager.js b/binaries/data/mods/public/simulation/ai/petra/navalManager.js
index 6a0da270da..5947187c61 100644
--- a/binaries/data/mods/public/simulation/ai/petra/navalManager.js
+++ b/binaries/data/mods/public/simulation/ai/petra/navalManager.js
@@ -695,12 +695,13 @@ m.NavalManager.prototype.Deserialize = function(gameState, data)
 		this[key] = data.properties[key];
 
 	this.transportPlans = [];
-	for (let dataPlan in data.transports)
+	for (let i in data.transports)
 	{
+		let dataPlan = data.transports[i];
 		let plan = new m.TransportPlan(gameState, [], dataPlan.startIndex, dataPlan.endIndex, dataPlan.endPos);
 		plan.Deserialize(dataPlan);
 		plan.init(gameState);
-		this.transportPlans[plan].push(plan);
+		this.transportPlans.push(plan);
 	}
 };
 
diff --git a/binaries/data/mods/public/simulation/ai/petra/queueplan-research.js b/binaries/data/mods/public/simulation/ai/petra/queueplan-research.js
index 63e4400cd9..25e3153475 100644
--- a/binaries/data/mods/public/simulation/ai/petra/queueplan-research.js
+++ b/binaries/data/mods/public/simulation/ai/petra/queueplan-research.js
@@ -77,7 +77,7 @@ m.ResearchPlan.prototype.Deserialize = function(gameState, data)
 	{
 		this.onStart = function (gameState) {
 			gameState.ai.HQ.econState = "growth";
-			 gameState.ai.HQ.OnTownPhase(gameState)
+			gameState.ai.HQ.OnTownPhase(gameState);
 		};
 		this.isGo = function (gameState) {
 			var ret = gameState.getPopulation() >= gameState.ai.Config.Economy.popForTown;
@@ -93,7 +93,7 @@ m.ResearchPlan.prototype.Deserialize = function(gameState, data)
 	}
 	else if (this.type == gameState.cityPhase())
 	{
-		plan.onStart = function (gameState) { gameState.ai.HQ.OnCityPhase(gameState) };
+		this.onStart = function (gameState) { gameState.ai.HQ.OnCityPhase(gameState) };
 	}
 };