diff --git a/src/crashlog.cpp b/src/crashlog.cpp
--- a/src/crashlog.cpp
+++ b/src/crashlog.cpp
@@ -413,9 +413,9 @@ bool CrashLog::WriteCrashLog(const char 
  */
 bool CrashLog::WriteSavegame(char *filename, const char *filename_last) const
 {
-	/* If the map array doesn't exist, saving will fail too. If the map got
+	/* If the map doesn't exist, saving will fail too. If the map got
 	 * initialised, there is a big chance the rest is initialised too. */
-	if (_m == nullptr) return false;
+	if (!Map::IsInitialized()) return false;
 
 	try {
 		GamelogEmergency();
diff --git a/src/map.cpp b/src/map.cpp
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -20,12 +20,12 @@
 extern "C" _CRTIMP void __cdecl _assert(void *, void *, unsigned);
 #endif
 
-uint _map_log_x;     ///< 2^_map_log_x == _map_size_x
-uint _map_log_y;     ///< 2^_map_log_y == _map_size_y
-uint _map_size_x;    ///< Size of the map along the X
-uint _map_size_y;    ///< Size of the map along the Y
-uint _map_size;      ///< The number of tiles on the map
-uint _map_tile_mask; ///< _map_size - 1 (to mask the mapsize)
+/* static */ uint Map::log_x;     ///< 2^_map_log_x == _map_size_x
+/* static */ uint Map::log_y;     ///< 2^_map_log_y == _map_size_y
+/* static */ uint Map::size_x;    ///< Size of the map along the X
+/* static */ uint Map::size_y;    ///< Size of the map along the Y
+/* static */ uint Map::size;      ///< The number of tiles on the map
+/* static */ uint Map::tile_mask; ///< _map_size - 1 (to mask the mapsize)
 
 Tile *_m = nullptr;          ///< Tiles of the map
 TileExtended *_me = nullptr; ///< Extended Tiles of the map
@@ -49,18 +49,18 @@ TileExtended *_me = nullptr; ///< Extend
 
 	Debug(map, 1, "Allocating map of size {}x{}", size_x, size_y);
 
-	_map_log_x = FindFirstBit(size_x);
-	_map_log_y = FindFirstBit(size_y);
-	_map_size_x = size_x;
-	_map_size_y = size_y;
-	_map_size = size_x * size_y;
-	_map_tile_mask = _map_size - 1;
+	Map::log_x = FindFirstBit(size_x);
+	Map::log_y = FindFirstBit(size_y);
+	Map::size_x = size_x;
+	Map::size_y = size_y;
+	Map::size = size_x * size_y;
+	Map::tile_mask = Map::size - 1;
 
 	free(_m);
 	free(_me);
 
-	_m = CallocT<Tile>(_map_size);
-	_me = CallocT<TileExtended>(_map_size);
+	_m = CallocT<Tile>(Map::size);
+	_me = CallocT<TileExtended>(Map::size);
 }
 
 
diff --git a/src/map_func.h b/src/map_func.h
--- a/src/map_func.h
+++ b/src/map_func.h
@@ -35,6 +35,15 @@ extern TileExtended *_me;
  * Size related data of the map.
  */
 struct Map {
+private:
+	static uint log_x;     ///< 2^_map_log_x == _map_size_x
+	static uint log_y;     ///< 2^_map_log_y == _map_size_y
+	static uint size_x;    ///< Size of the map along the X
+	static uint size_y;    ///< Size of the map along the Y
+	static uint size;      ///< The number of tiles on the map
+	static uint tile_mask; ///< _map_size - 1 (to mask the mapsize)
+
+public:
 	static void Allocate(uint size_x, uint size_y);
 
 	/**
@@ -44,8 +53,7 @@ struct Map {
 	 */
 	static inline uint LogX()
 	{
-		extern uint _map_log_x;
-		return _map_log_x;
+		return Map::log_x;
 	}
 
 	/**
@@ -55,8 +63,7 @@ struct Map {
 	 */
 	static inline uint LogY()
 	{
-		extern uint _map_log_y;
-		return _map_log_y;
+		return Map::log_y;
 	}
 
 	/**
@@ -65,8 +72,7 @@ struct Map {
 	 */
 	static inline uint SizeX()
 	{
-		extern uint _map_size_x;
-		return _map_size_x;
+		return Map::size_x;
 	}
 
 	/**
@@ -75,8 +81,7 @@ struct Map {
 	 */
 	static inline uint SizeY()
 	{
-		extern uint _map_size_y;
-		return _map_size_y;
+		return Map::size_y;
 	}
 
 	/**
@@ -85,8 +90,7 @@ struct Map {
 	 */
 	static inline uint Size()
 	{
-		extern uint _map_size;
-		return _map_size;
+		return Map::size;
 	}
 
 	/**
@@ -115,8 +119,7 @@ struct Map {
 	 */
 	static inline TileIndex WrapToMap(uint tile)
 	{
-		extern uint _map_tile_mask;
-		return tile & _map_tile_mask;
+		return tile & Map::tile_mask;
 	}
 
 	/**
@@ -145,10 +148,18 @@ struct Map {
 		 * just half of it. */
 		return CeilDiv((n << Map::LogX()) + (n << Map::LogY()), 1 << 9);
 	}
+
+	/**
+	 * Check whether the map has been initialized, as to not try to save the map
+	 * during crashlog when the map is not there yet.
+	 * @return true when the map has been allocated/initialized.
+	 */
+	static bool IsInitialized()
+	{
+		return _m != nullptr;
+	}
 };
 
-static inline void AllocateMap(uint size_x, uint size_y) { Map::Allocate(size_x, size_y); }
-
 /**
  * An offset value between two tiles.
  *
diff --git a/src/misc.cpp b/src/misc.cpp
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -61,7 +61,7 @@ void InitializeGame(uint size_x, uint si
 	 * related to the new game we're about to start/load. */
 	UnInitWindowSystem();
 
-	AllocateMap(size_x, size_y);
+	Map::Allocate(size_x, size_y);
 
 	_pause_mode = PM_UNPAUSED;
 	_game_speed = 100;
diff --git a/src/saveload/map_sl.cpp b/src/saveload/map_sl.cpp
--- a/src/saveload/map_sl.cpp
+++ b/src/saveload/map_sl.cpp
@@ -49,7 +49,7 @@ struct MAPSChunkHandler : ChunkHandler {
 		SlGlobList(slt);
 		if (!IsSavegameVersionBefore(SLV_RIFF_TO_ARRAY) && SlIterateArray() != -1) SlErrorCorrupt("Too many MAPS entries");
 
-		AllocateMap(_map_dim_x, _map_dim_y);
+		Map::Allocate(_map_dim_x, _map_dim_y);
 	}
 
 	void LoadCheck(size_t) const override
diff --git a/src/saveload/oldloader_sl.cpp b/src/saveload/oldloader_sl.cpp
--- a/src/saveload/oldloader_sl.cpp
+++ b/src/saveload/oldloader_sl.cpp
@@ -1465,7 +1465,7 @@ static bool LoadOldGameDifficulty(Loadga
 static bool LoadOldMapPart1(LoadgameState *ls, int num)
 {
 	if (_savegame_type == SGT_TTO) {
-		AllocateMap(OLD_MAP_SIZE, OLD_MAP_SIZE);
+		Map::Allocate(OLD_MAP_SIZE, OLD_MAP_SIZE);
 	}
 
 	for (uint i = 0; i < OLD_MAP_SIZE; i++) {