Program: 19990
Project: 19990
Buggy source:
/** 
 * K�sittelee ammuksen teko�lyn.
 */
public final void handleAi(){
  if (explodeOnTarget) {
    double distance=Math.sqrt(Math.pow(x - targetX,2) + Math.pow(y - targetY,2));
    if (distance - collisionRadius - 20 <= 0) {
      setUnactive();
      active=false;
      parent.triggerCluster(8,x,y);
    }
  }
  for (int i=wrapper.enemies.size() - 1; i >= 0; --i) {
    if (wrapper.enemyStates.get(i) == 1 || wrapper.enemyStates.get(i) == 3) {
      double distance=Math.sqrt(Math.pow(x - wrapper.enemies.get(i).x,2) + Math.pow(y - wrapper.enemies.get(i).y,2));
      if (distance - wrapper.enemies.get(i).collisionRadius - collisionRadius <= 0) {
        wrapper.projectileStates.set(listId,2);
        if (damageType == ProjectileLaser.DAMAGE_ON_TOUCH) {
          wrapper.enemies.get(i).triggerCollision(GameObject.COLLISION_WITH_PROJECTILE,damageOnTouch,armorPiercing);
          if (explodeOnTarget) {
            setUnactive();
            active=false;
            parent.triggerCluster(8,x,y);
          }
          setAction(GLRenderer.ANIMATION_DESTROY,1,1,1);
        }
 else         if (damageType == ProjectileLaser.EXPLODE_ON_TOUCH) {
          setAction(GLRenderer.ANIMATION_DESTROY,1,1,1);
          causeExplosion();
        }
        break;
      }
      if (distance - wrapper.enemies.get(i).collisionRadius - damageRadius <= 0) {
        wrapper.enemies.get(i).health-=(damageOnRadius * (1 - 0.15 * wrapper.enemies.get(i).defence));
      }
    }
  }
  if (explodeTime > 0) {
    currentTime=android.os.SystemClock.uptimeMillis();
    if (currentTime - startTime >= explodeTime) {
      wrapper.projectileStates.set(listId,2);
      setAction(GLRenderer.ANIMATION_DESTROY,1,1,1);
      causeExplosion();
    }
  }
  if (wrapper.player.x + x < -Options.scaledScreenWidth || wrapper.player.x + x > Options.scaledScreenWidth || wrapper.player.y + y < -Options.scaledScreenHeight || wrapper.player.y + y > Options.scaledScreenHeight) {
    setUnactive();
  }
}

Fixed version (ground truth):
/** 
 * K�sittelee ammuksen teko�lyn.
 */
public final void handleAi(){
  if (explodeOnTarget) {
    double distance=Math.sqrt(Math.pow(x - targetX,2) + Math.pow(y - targetY,2));
    if (distance - collisionRadius - 20 <= 0) {
      setUnactive();
      active=false;
      parent.triggerCluster(8,x,y);
    }
  }
  for (int i=wrapper.enemies.size() - 1; i >= 0; --i) {
    if (wrapper.enemyStates.get(i) == wrapper.FULL_ACTIVITY) {
      double distance=Math.sqrt(Math.pow(x - wrapper.enemies.get(i).x,2) + Math.pow(y - wrapper.enemies.get(i).y,2));
      if (distance - wrapper.enemies.get(i).collisionRadius - collisionRadius <= 0) {
        wrapper.projectileStates.set(listId,2);
        if (damageType == ProjectileLaser.DAMAGE_ON_TOUCH) {
          wrapper.enemies.get(i).triggerCollision(GameObject.COLLISION_WITH_PROJECTILE,damageOnTouch,armorPiercing);
          if (explodeOnTarget) {
            setUnactive();
            active=false;
            parent.triggerCluster(8,x,y);
          }
          setAction(GLRenderer.ANIMATION_DESTROY,1,1,1);
        }
 else         if (damageType == ProjectileLaser.EXPLODE_ON_TOUCH) {
          setAction(GLRenderer.ANIMATION_DESTROY,1,1,1);
          causeExplosion();
        }
        break;
      }
      if (distance - wrapper.enemies.get(i).collisionRadius - damageRadius <= 0) {
        wrapper.enemies.get(i).health-=(damageOnRadius * (1 - 0.15 * wrapper.enemies.get(i).defence));
      }
    }
  }
  if (explodeTime > 0) {
    currentTime=android.os.SystemClock.uptimeMillis();
    if (currentTime - startTime >= explodeTime) {
      wrapper.projectileStates.set(listId,2);
      setAction(GLRenderer.ANIMATION_DESTROY,1,1,1);
      causeExplosion();
    }
  }
  if (wrapper.player.x + x < -Options.scaledScreenWidth || wrapper.player.x + x > Options.scaledScreenWidth || wrapper.player.y + y < -Options.scaledScreenHeight || wrapper.player.y + y > Options.scaledScreenHeight) {
    setUnactive();
  }
}