Fix crash when STOR is next to PIPE and has an invalid tmp value (http://tpt.io/~1768004)

src/gui/game/GameController.cpp

@@ -1476,7 +1476,7 @@ bool GameController::IsValidElement(int type)
 {
 	if(gameModel && gameModel->GetSimulation())
 	{
-		return (type > 0 && type < PT_NUM && gameModel->GetSimulation()->elements[type].Enabled);
+		return (type && gameModel->GetSimulation()->IsValidElement(type));
 	}
 	else
 		return false;

src/simulation/Simulation.h

@@ -132,6 +132,9 @@ public:
 	int eval_move(int pt, int nx, int ny, unsigned *rr);
 	void init_can_move();
 	bool IsWallBlocking(int x, int y, int type);
+	bool IsValidElement(int type) {
+		return (type >= 0 && type < PT_NUM && elements[type].Enabled);
+	}
 	void create_cherenkov_photon(int pp);
 	void create_gain_photon(int pp);
 	void kill_part(int i);

src/simulation/elements/PIPE.cpp

@@ -210,7 +210,7 @@ int Element_PIPE::update(UPDATE_FUNC_ARGS)
 						transfer_part_to_pipe(parts+(r>>8), parts+i);
 						sim->kill_part(r>>8);
 					}
-					else if ((parts[i].tmp&0xFF) == 0 && (r&0xFF)==PT_STOR && parts[r>>8].tmp && (sim->elements[parts[r>>8].tmp].Properties & (TYPE_PART | TYPE_LIQUID | TYPE_GAS | TYPE_ENERGY)))
+					else if ((parts[i].tmp&0xFF) == 0 && (r&0xFF)==PT_STOR && parts[r>>8].tmp>0 && sim->IsValidElement(parts[r>>8].tmp) && (sim->elements[parts[r>>8].tmp].Properties & (TYPE_PART | TYPE_LIQUID | TYPE_GAS | TYPE_ENERGY)))
 					{
 						// STOR stores properties in the same places as PIPE does
 						transfer_pipe_to_pipe(parts+(r>>8), parts+i);

src/simulation/elements/STOR.cpp

@@ -50,6 +50,8 @@ Element_STOR::Element_STOR()
 int Element_STOR::update(UPDATE_FUNC_ARGS)
  {
 	int r, rx, ry, np, rx1, ry1;
+	if (!sim->IsValidElement(parts[i].tmp))
+		parts[i].tmp = 0;
 	if(parts[i].life && !parts[i].tmp)
 		parts[i].life--;
 	for (rx=-2; rx<3; rx++)