Fix concurrent deletion on Maze reset

1 files changed, 3 insertions, 2 deletions

diff --git a/src/ch/epfl/maze/physical/Maze.java b/src/ch/epfl/maze/physical/Maze.java
index e58a56a..bff8791 100644
--- a/src/ch/epfl/maze/physical/Maze.java
+++ b/src/ch/epfl/maze/physical/Maze.java
@@ -75,8 +75,9 @@ public final class Maze extends World {
 
     @Override
     public void reset() {
-        for (Animal a : this.animals) this.removeAnimal(a);
-        for (Animal a : this.animalHistory) this.addAnimal(a.copy());
+        this.animalHistory.addAll(this.animals);
+        this.animals.clear();
+        this.animalHistory.forEach(a -> this.addAnimal(a.copy()));
         this.animalHistory.clear();
     }
 }