Still stumped with EAccess Violation Error (UnDelphiX)

[Wizard]

This is my collision procedure:

procedure TFormGame.BulletCollision(Sender:TObject;var done:Boolean);
begin
   if (sender is TEnemy) then
        begin
             Enemy := TEnemy(sender);
             if (not Enemy.Hit) then
                begin
                  Explode := TExplode.Create(dxSpriteEngine.Engine);
                  Explode.X := Enemy.X;
                  Explode.Y := Enemy.Y;
                  Enemy.hit := true;
                  Enemy.Dead;
                  Bullet.Dead;
                  Inc(Points,100);
                  Inc(EnemyCount,1);
                  if (enemy.hit)then
                  begin
                    FormGame.DXWaveList.Items.Find('Explode').Play(false);
                    Enemy := TEnemy.create(dxspriteEngine.Engine);
                  end;
                end;
        end
         else