Index: ps/trunk/source/main.cpp
===================================================================
--- ps/trunk/source/main.cpp
+++ ps/trunk/source/main.cpp
@@ -1,4 +1,4 @@
-/* Copyright (C) 2017 Wildfire Games.
+/* Copyright (C) 2018 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -304,8 +304,7 @@
 #endif
 	ENSURE(realTimeSinceLastFrame > 0.0f);
 
-	// decide if update/render is necessary
-	bool need_render = !g_app_minimized;
+	// Decide if update is necessary
 	bool need_update = true;
 
 	// If we are not running a multiplayer game, disable updates when the game is
@@ -369,9 +368,11 @@
 	g_UserReporter.Update();
 
 	g_Console->Update(realTimeSinceLastFrame);
-
 	ogl_WarnIfError();
-	if (need_render)
+
+	// We do not have to render an inactive fullscreen frame, because it can
+	// lead to errors for some graphic card families.
+	if (!g_app_minimized && (g_app_has_focus || !g_VideoMode.IsInFullscreen()))
 	{
 		Render();
 
Index: ps/trunk/source/ps/VideoMode.h
===================================================================
--- ps/trunk/source/ps/VideoMode.h
+++ ps/trunk/source/ps/VideoMode.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2014 Wildfire Games.
+/* Copyright (C) 2018 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -53,6 +53,11 @@
 	bool SetFullscreen(bool fullscreen);
 
 	/**
+	* Returns true if window runs in fullscreen mode.
+	*/
+	bool IsInFullscreen() const;
+
+	/**
 	 * Switch between fullscreen and windowed mode.
 	 */
 	bool ToggleFullscreen();
Index: ps/trunk/source/ps/VideoMode.cpp
===================================================================
--- ps/trunk/source/ps/VideoMode.cpp
+++ ps/trunk/source/ps/VideoMode.cpp
@@ -1,4 +1,4 @@
-/* Copyright (C) 2017 Wildfire Games.
+/* Copyright (C) 2018 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -401,6 +401,11 @@
 	return SetFullscreen(!m_IsFullscreen);
 }
 
+bool CVideoMode::IsInFullscreen() const
+{
+	return m_IsFullscreen;
+}
+
 void CVideoMode::UpdatePosition(int x, int y)
 {
 	if (!m_IsFullscreen)