diff --git a/binaries/data/mods/public/gui/campaigns/default_menu/endgame/endgame.js b/binaries/data/mods/public/gui/campaigns/default_menu/endgame/endgame.js
index 113e7ae5b2..32f30805e6 100644
--- a/binaries/data/mods/public/gui/campaigns/default_menu/endgame/endgame.js
+++ b/binaries/data/mods/public/gui/campaigns/default_menu/endgame/endgame.js
@@ -8,4 +8,6 @@ function init(endGameData)
 	const run = CampaignRun.getCurrentRun();
 	if (endGameData.won)
 		markLevelComplete(run, endGameData.initData.levelID);
+
+	return Promise.resolve();
 }
diff --git a/binaries/data/mods/public/gui/session/campaigns/CampaignSession.js b/binaries/data/mods/public/gui/session/campaigns/CampaignSession.js
index c2d6238eb6..4d327922e7 100644
--- a/binaries/data/mods/public/gui/session/campaigns/CampaignSession.js
+++ b/binaries/data/mods/public/gui/session/campaigns/CampaignSession.js
@@ -1,9 +1,9 @@
 class CampaignSession
 {
-	constructor(data, closePageCallback)
+	constructor(data)
 	{
 		this.run = new CampaignRun(data.run).load();
-		registerPlayersFinishedHandler(this.onFinish.bind(this, closePageCallback));
+		registerPlayersFinishedHandler(this.onFinish.bind(this));
 		this.endGameData = {
 			"won": false,
 			"initData": data,
@@ -11,7 +11,7 @@ class CampaignSession
 		};
 	}
 
-	onFinish(closePageCallback, players, won)
+	onFinish(players, won)
 	{
 		const playerID = Engine.GetPlayerID();
 		if (players.indexOf(playerID) === -1)
@@ -24,7 +24,6 @@ class CampaignSession
 
 		// Run the endgame script.
 		Engine.OpenChildPage(this.getEndGame(), this.endGameData);
-		closePageCallback();
 	}
 
 	getMenu()
diff --git a/binaries/data/mods/public/gui/session/session.js b/binaries/data/mods/public/gui/session/session.js
index 587a711ffe..afb7491080 100644
--- a/binaries/data/mods/public/gui/session/session.js
+++ b/binaries/data/mods/public/gui/session/session.js
@@ -277,11 +277,8 @@ function init(initData, hotloadData)
 			restoreSavedGameData(initData.savedGUIData);
 	}
 
-	const promise = new Promise(closePageCallback =>
-	{
-		if (g_InitAttributes.campaignData)
-			g_CampaignSession = new CampaignSession(g_InitAttributes.campaignData, closePageCallback);
-	});
+	if (g_InitAttributes.campaignData)
+		g_CampaignSession = new CampaignSession(g_InitAttributes.campaignData);
 
 	const mapCache = new MapCache();
 	g_Cheats = new Cheats();
@@ -345,9 +342,7 @@ function init(initData, hotloadData)
 
 	setTimeout(displayGamestateNotifications, 1000);
 
-	if (g_IsNetworked)
-		return Promise.race([promise, handleNetMessages()]);
-	return promise;
+	return g_IsNetworked ? handleNetMessages() : new Promise(() => {});
 }
 
 function registerPlayersInitHandler(handler)