diff --git a/source/gui/GUIManager.cpp b/source/gui/GUIManager.cpp
index 701040cb59..9e3766ae44 100644
--- a/source/gui/GUIManager.cpp
+++ b/source/gui/GUIManager.cpp
@@ -73,9 +73,9 @@ CGUIManager::~CGUIManager()
 	UnregisterFileReloadFunc(ReloadChangedFileCB, this);
 }
 
-bool CGUIManager::HasPages()
+size_t CGUIManager::GetPageCount() const
 {
-	return !m_PageStack.empty();
+	return m_PageStack.size();
 }
 
 void CGUIManager::SwitchPage(const CStrW& pageName, ScriptInterface* srcScriptInterface, JS::HandleValue initData)
diff --git a/source/gui/GUIManager.h b/source/gui/GUIManager.h
index e35ff268a7..fbc83201a3 100644
--- a/source/gui/GUIManager.h
+++ b/source/gui/GUIManager.h
@@ -59,9 +59,9 @@ public:
 	shared_ptr<CGUI> GetActiveGUI() { return top(); }
 
 	/**
-	 * Returns whether there are any current pages.
+	 * Returns the number of currently open GUI pages.
 	 */
-	bool HasPages();
+	size_t GetPageCount() const;
 
 	/**
 	 * Load a new GUI page and make it active. All current pages will be destroyed.
diff --git a/source/gui/scripting/JSInterface_GUIManager.cpp b/source/gui/scripting/JSInterface_GUIManager.cpp
index 89a22e9974..aa79486c52 100644
--- a/source/gui/scripting/JSInterface_GUIManager.cpp
+++ b/source/gui/scripting/JSInterface_GUIManager.cpp
@@ -39,6 +39,14 @@ void JSI_GUIManager::SwitchGuiPage(ScriptInterface::CxPrivate* pCxPrivate, const
 
 void JSI_GUIManager::PopGuiPage(ScriptInterface::CxPrivate* pCxPrivate, JS::HandleValue args)
 {
+	if (g_GUI->GetPageCount() < 2)
+	{
+		JSContext* cx = pCxPrivate->pScriptInterface->GetContext();
+		JSAutoRequest rq(cx);
+		JS_ReportError(cx, "Can't pop GUI pages when less than two pages are opened!");
+		return;
+	}
+
 	g_GUI->PopPage(pCxPrivate->pScriptInterface->WriteStructuredClone(args));
 }
 
diff --git a/source/ps/Game.cpp b/source/ps/Game.cpp
index 7fc6e4b76d..54937b7f49 100644
--- a/source/ps/Game.cpp
+++ b/source/ps/Game.cpp
@@ -320,7 +320,7 @@ PSRETURN CGame::ReallyStartGame()
 		g_NetClient->LoadFinished();
 
 	// Call the reallyStartGame GUI function, but only if it exists
-	if (g_GUI && g_GUI->HasPages())
+	if (g_GUI && g_GUI->GetPageCount())
 	{
 		JS::RootedValue global(cx, g_GUI->GetActiveGUI()->GetGlobalObject());
 		if (g_GUI->GetActiveGUI()->GetScriptInterface()->HasProperty(global, "reallyStartGame"))
diff --git a/source/ps/GameSetup/GameSetup.cpp b/source/ps/GameSetup/GameSetup.cpp
index d35b2f52df..85cac57c7e 100644
--- a/source/ps/GameSetup/GameSetup.cpp
+++ b/source/ps/GameSetup/GameSetup.cpp
@@ -1667,7 +1667,7 @@ void CancelLoad(const CStrW& message)
 	LDR_Cancel();
 
 	if (g_GUI &&
-	    g_GUI->HasPages() &&
+	    g_GUI->GetPageCount() &&
 	    pScriptInterface->HasProperty(global, "cancelOnLoadGameError"))
 		pScriptInterface->CallFunctionVoid(global, "cancelOnLoadGameError", message);
 }