--- a/src/error.h
+++ b/src/error.h
@@ -23,5 +23,6 @@
 };
 
 void ShowErrorMessage(StringID summary_msg, StringID detailed_msg, WarningLevel wl, int x = 0, int y = 0, uint textref_stack_size = 0, const uint32 *textref_stack = NULL);
+void ClearErrorMessages();
 
 #endif /* ERROR_H */

--- a/src/error_gui.cpp
+++ b/src/error_gui.cpp
@@ -25,6 +25,7 @@
 #include "window_gui.h"
 
 #include "table/strings.h"
+#include <list>
 
 /** Widgets of the error message windows */
 enum ErrorMessageWidgets {
@@ -82,6 +83,7 @@
 	Point position;                 ///< Position of the error message window.
 	CompanyID face;                 ///< Company belonging to the face being shown. #INVALID_COMPANY if no face present.
 
+public:
 	/**
 	 * Copy the given data into our instace.
 	 * @param data The data to copy.
@@ -91,7 +93,6 @@
 		*this = data;
 	}
 
-public:
 	/**
 	 * Display an error message in a window.
 	 * @param summary_msg  General error message showed in first line. Must be valid.
@@ -122,6 +123,11 @@
 	}
 };
 
+/** Define a queue with errors. */
+typedef std::list<ErrorMessageData> ErrorList;
+/** The actual queue with errors. */
+ErrorList _errors;
+
 /** Window class for displaying an error message window. */
 struct ErrmsgWindow : public Window, ErrorMessageData {
 private:
@@ -255,6 +261,11 @@
 	~ErrmsgWindow()
 	{
 		SetRedErrorSquare(INVALID_TILE);
+
+		if (!_errors.empty()) {
+			new ErrmsgWindow(_errors.front());
+			_errors.pop_front();
+		}
 	}
 
 	virtual EventState OnKeyPress(uint16 key, uint16 keycode)
@@ -263,9 +274,26 @@
 		delete this;
 		return ES_HANDLED;
 	}
+
+	/**
+	 * Check whether the currently shown error message was critical or not.
+	 * @return True iff the message was critical.
+	 */
+	bool IsCritical()
+	{
+		return this->duration == 0;
+	}
 };
 
 /**
+ * Clear all errors from the queue.
+ */
+void ClearErrorMessages()
+{
+	_errors.clear();
+}
+
+/**
  * Display an error message in a window.
  * @param summary_msg  General error message showed in first line. Must be valid.
  * @param detailed_msg Detailed error message showed in second line. Can be INVALID_STRING_ID.
@@ -304,7 +332,19 @@
 
 	if (_settings_client.gui.errmsg_duration == 0 && !no_timeout) return;
 
-	DeleteWindowById(WC_ERRMSG, 0);
-	ErrorMessageData data(summary_msg, detailed_msg, no_timeout ? _settings_client.gui.errmsg_duration : 0, x, y, textref_stack_size, textref_stack);
-	new ErrmsgWindow(data);
+	ErrorMessageData data(summary_msg, detailed_msg, no_timeout ? 0 : _settings_client.gui.errmsg_duration, x, y, textref_stack_size, textref_stack);
+
+	ErrmsgWindow *w = (ErrmsgWindow*)FindWindowById(WC_ERRMSG, 0);
+	if (w != NULL && w->IsCritical()) {
+		/* A critical error is currently shown. */
+		if (wl == WL_CRITICAL) {
+			/* Push another critical error in the queue of errors,
+			 * but do not put other errors in the queue. */
+			_errors.push_back(data);
+		}
+	} else {
+		/* Nothing or a non-critical error was shown. */
+		delete w;
+		new ErrmsgWindow(data);
+	}
 }

--- a/src/fios_gui.cpp
+++ b/src/fios_gui.cpp
@@ -546,7 +546,7 @@
 
 					strecpy(_file_to_saveload.name, name, lastof(_file_to_saveload.name));
 					strecpy(_file_to_saveload.title, this->selected->title, lastof(_file_to_saveload.title));
-
+					ClearErrorMessages();
 					delete this;
 				}
 				break;

--- a/src/genworld_gui.cpp
+++ b/src/genworld_gui.cpp
@@ -29,6 +29,7 @@
 #include "core/geometry_func.hpp"
 #include "core/random_func.hpp"
 #include "progress.h"
+#include "error.h"
 
 #include "table/strings.h"
 #include "table/sprites.h"
@@ -305,6 +306,7 @@
 static void StartGeneratingLandscape(GenenerateLandscapeWindowMode mode)
 {
 	DeleteAllNonVitalWindows();
+	ClearErrorMessages();
 
 	/* Copy all XXX_newgame to XXX when coming from outside the editor */
 	MakeNewgameSettingsLive();

--- a/src/intro_gui.cpp
+++ b/src/intro_gui.cpp
@@ -333,7 +333,10 @@
 
 static void AskExitToGameMenuCallback(Window *w, bool confirmed)
 {
-	if (confirmed) _switch_mode = SM_MENU;
+	if (confirmed) {
+		_switch_mode = SM_MENU;
+		ClearErrorMessages();
+	}
 }
 
 void AskExitToGameMenu()

--- a/src/network/network_client.cpp
+++ b/src/network/network_client.cpp
@@ -841,6 +841,7 @@
 	lf->Reset();
 
 	/* The map is done downloading, load it */
+	ClearErrorMessages();
 	bool load_success = SafeLoad(NULL, SL_LOAD, GM_NORMAL, NO_DIRECTORY, lf);
 
 	/* Long savegame loads shouldn't affect the lag calculation! */