diff --git a/src/simulation/Simulation.cpp b/src/simulation/Simulation.cpp
index bf4bc7b0f1..9194d442de 100644
--- a/src/simulation/Simulation.cpp
+++ b/src/simulation/Simulation.cpp
@@ -4056,6 +4056,9 @@ void Simulation::UpdateParticles(int start, int end)
 				dy = parts[i].vy*ISTP/mv;
 				fin_xf = parts[i].x;
 				fin_yf = parts[i].y;
+				fin_x = (int)(fin_xf+0.5f);
+				fin_y = (int)(fin_yf+0.5f);
+				bool closedEholeStart = this->InBounds(fin_x, fin_y) && (bmap[fin_y/CELL][fin_x/CELL] == WL_EHOLE && !emap[fin_y/CELL][fin_x/CELL]);
 				while (1)
 				{
 					mv -= ISTP;
@@ -4092,7 +4095,7 @@ void Simulation::UpdateParticles(int start, int end)
 					//block if particle can't move (0), or some special cases where it returns 1 (can_move = 3 but returns 1 meaning particle will be eaten)
 					//also photons are still blocked (slowed down) by any particle (even ones it can move through), and absorb wall also blocks particles
 					int eval = eval_move(t, fin_x, fin_y, NULL);
-					if (!eval || (can_move[t][pmap[fin_y][fin_x]&0xFF] == 3 && eval == 1) || (t == PT_PHOT && pmap[fin_y][fin_x]) || bmap[fin_y/CELL][fin_x/CELL]==WL_DESTROYALL)
+					if (!eval || (can_move[t][pmap[fin_y][fin_x]&0xFF] == 3 && eval == 1) || (t == PT_PHOT && pmap[fin_y][fin_x]) || bmap[fin_y/CELL][fin_x/CELL]==WL_DESTROYALL || closedEholeStart!=(bmap[fin_y/CELL][fin_x/CELL] == WL_EHOLE && !emap[fin_y/CELL][fin_x/CELL]))
 					{
 						// found an obstacle
 						clear_xf = fin_xf-dx;
diff --git a/src/simulation/Simulation.h b/src/simulation/Simulation.h
index 801f766066..b4627846fd 100644
--- a/src/simulation/Simulation.h
+++ b/src/simulation/Simulation.h
@@ -207,6 +207,11 @@ class Simulation
 	void clear_sim();
 	Simulation();
 	~Simulation();
+
+	bool InBounds(int x, int y)
+	{
+		return (x>=0 && y>=0 && x<XRES && y<YRES);
+	}
 };
 
 #endif /* SIMULATION_H */