fix

src/client/clientmap.cpp

@@ -1454,7 +1454,7 @@ void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
     draw_order.reserve(m_drawlist.size());
 	for (auto &i : m_drawlist) {
 		const v3s16 block_pos = i.first;
-		auto block = i.second;
+		const auto & block = i.second;
 		int mesh_step = getLodStep(
 				m_control, getNodeBlockPos(m_camera_position_node), block->getPos(), speedf);
 

src/fm_far_calc.cpp

@@ -237,7 +237,11 @@ block_step_t getFarStepCellSize(const MapDrawControl &draw_control, const v3bpos
 			return {};
 #endif
 */
-		const auto step = int(log(res->size) / log(2)) - cell_size_pow;
+		const auto step1 = int(log(res->size) / log(2));
+		if (cell_size_pow >= step1) {
+			return 0;
+		}
+		const auto step = step1 - cell_size_pow;
 		return step;
 	}
 	return 0; // TODO! fix intersection with cell_size_pow