Program: 166762
Project: 166762
Buggy source:
@Override public void update(Effect nextEffect){
  if (active) {
    nar.stop();
    executed=false;
    for (int i=0; i < 5; i++) {
      nar.step(1);
      if (executed) {
        break;
      }
    }
  }
  if (!target.equals(lasttarget) || target.equals(lasttarget) && ("String_Node_Str".equals(opname) || "String_Node_Str".equals(opname) || "String_Node_Str".equals(opname))) {
    getfeedback=true;
  }
  lasttarget=target;
  PVector current=new PVector(x,y);
  if (nextEffect == null) {
    List<PVector> path=Grid2DSpace.Shortest_Path(space,this,current,target);
    actions.clear();
    if (path != null) {
      if (inventorybag != null) {
        inventorybag.x=(int)current.x;
        inventorybag.y=(int)current.y;
        inventorybag.cx=(int)current.x;
        inventorybag.cy=(int)current.y;
      }
      if (inventorybag == null || !(inventorybag instanceof Key)) {
        keyn=-1;
      }
      if (path.size() <= 1) {
        nar.step(1);
        if (getfeedback && !"String_Node_Str".equals(goal) && current.equals(target)) {
          getfeedback=false;
          GridObject obi=null;
          if (!"String_Node_Str".equals(opname)) {
            for (            GridObject gridi : space.objects) {
              if (gridi instanceof LocalGridObject && ((LocalGridObject)gridi).doorname.equals(goal) && ((LocalGridObject)gridi).x == (int)current.x && ((LocalGridObject)gridi).y == (int)current.y) {
                obi=gridi;
                break;
              }
            }
          }
          if (obi != null || cells.readCells[(int)current.x][(int)current.y].name.equals(goal)) {
            if ("String_Node_Str".equals(opname)) {
              if (inventorybag != null && inventorybag instanceof LocalGridObject) {
                LocalGridObject ob=(LocalGridObject)inventorybag;
                ob.x=(int)current.x;
                ob.y=(int)current.y;
                space.objects.add(ob);
              }
              inventorybag=(LocalGridObject)obi;
              if (obi != null) {
                space.objects.remove(obi);
                if (inventorybag.doorname.startsWith("String_Node_Str")) {
                  keyn=Integer.parseInt(inventorybag.doorname.replaceAll("String_Node_Str","String_Node_Str"));
                  for (int i=0; i < cells.h; i++) {
                    for (int j=0; j < cells.w; j++) {
                      if (Hauto.doornumber(cells.readCells[i][j]) == keyn) {
                        cells.readCells[i][j].is_solid=false;
                        cells.writeCells[i][j].is_solid=false;
                      }
                    }
                  }
                }
              }
              nar.addInput("String_Node_Str" + goal + "String_Node_Str");
            }
 else             if ("String_Node_Str".equals(opname)) {
              for (int i=0; i < cells.h; i++) {
                for (int j=0; j < cells.w; j++) {
                  if (cells.readCells[i][j].name.equals(goal)) {
                    if (cells.readCells[i][j].logic == Logic.SWITCH) {
                      cells.readCells[i][j].logic=Logic.OFFSWITCH;
                      cells.writeCells[i][j].logic=Logic.OFFSWITCH;
                      cells.readCells[i][j].charge=0.0f;
                      cells.writeCells[i][j].charge=0.0f;
                      nar.addInput("String_Node_Str" + goal + "String_Node_Str");
                    }
                  }
                }
              }
            }
 else             if ("String_Node_Str".equals(opname)) {
              for (int i=0; i < cells.h; i++) {
                for (int j=0; j < cells.w; j++) {
                  if (cells.readCells[i][j].name.equals(goal)) {
                    if (cells.readCells[i][j].logic == Logic.OFFSWITCH) {
                      cells.readCells[i][j].logic=Logic.SWITCH;
                      cells.writeCells[i][j].logic=Logic.SWITCH;
                      cells.readCells[i][j].charge=1.0f;
                      cells.writeCells[i][j].charge=1.0f;
                      nar.addInput("String_Node_Str" + goal + "String_Node_Str");
                    }
                  }
                }
              }
            }
            if ("String_Node_Str".equals(opname)) {
              nar.addInput("String_Node_Str" + goal + "String_Node_Str");
              active=true;
            }
          }
        }
        opname="String_Node_Str";
      }
 else {
        active=false;
        int numSteps=Math.min(10,path.size());
        float cx=x;
        float cy=y;
        for (int i=1; i < numSteps; i++) {
          PVector next=path.get(i);
          int dx=(int)(next.x - cx);
          int dy=(int)(next.y - cy);
          if ((dx == 0) && (dy == 1)) {
            turn(UP);
            forward(1);
          }
          if ((dx == 1) && (dy == 0)) {
            turn(RIGHT);
            forward(1);
          }
          if ((dx == -1) && (dy == 0)) {
            turn(LEFT);
            forward(1);
          }
          if ((dx == 0) && (dy == -1)) {
            turn(DOWN);
            forward(1);
          }
          cx=next.x;
          cy=next.y;
        }
      }
    }
  }
}

Fixed version (ground truth):
@Override public void update(Effect nextEffect){
  if (active) {
    nar.stop();
    executed=false;
    for (int i=0; i < 5; i++) {
      nar.step(1);
      if (executed) {
        break;
      }
    }
  }
  if (!target.equals(lasttarget) || target.equals(lasttarget) && ("String_Node_Str".equals(opname) || "String_Node_Str".equals(opname) || "String_Node_Str".equals(opname))) {
    getfeedback=true;
  }
  lasttarget=target;
  PVector current=new PVector(x,y);
  if (nextEffect == null) {
    List<PVector> path=Grid2DSpace.Shortest_Path(space,this,current,target);
    actions.clear();
    if (path != null) {
      if (inventorybag != null) {
        inventorybag.x=(int)current.x;
        inventorybag.y=(int)current.y;
        inventorybag.cx=(int)current.x;
        inventorybag.cy=(int)current.y;
      }
      if (inventorybag == null || !(inventorybag instanceof Key)) {
        keyn=-1;
      }
      if (path.size() <= 1) {
        active=true;
        nar.step(1);
        if (getfeedback && !"String_Node_Str".equals(goal) && current.equals(target)) {
          getfeedback=false;
          GridObject obi=null;
          if (!"String_Node_Str".equals(opname)) {
            for (            GridObject gridi : space.objects) {
              if (gridi instanceof LocalGridObject && ((LocalGridObject)gridi).doorname.equals(goal) && ((LocalGridObject)gridi).x == (int)current.x && ((LocalGridObject)gridi).y == (int)current.y) {
                obi=gridi;
                break;
              }
            }
          }
          if (obi != null || cells.readCells[(int)current.x][(int)current.y].name.equals(goal)) {
            if ("String_Node_Str".equals(opname)) {
              if (inventorybag != null && inventorybag instanceof LocalGridObject) {
                LocalGridObject ob=(LocalGridObject)inventorybag;
                ob.x=(int)current.x;
                ob.y=(int)current.y;
                space.objects.add(ob);
              }
              inventorybag=(LocalGridObject)obi;
              if (obi != null) {
                space.objects.remove(obi);
                if (inventorybag.doorname.startsWith("String_Node_Str")) {
                  keyn=Integer.parseInt(inventorybag.doorname.replaceAll("String_Node_Str","String_Node_Str"));
                  for (int i=0; i < cells.h; i++) {
                    for (int j=0; j < cells.w; j++) {
                      if (Hauto.doornumber(cells.readCells[i][j]) == keyn) {
                        cells.readCells[i][j].is_solid=false;
                        cells.writeCells[i][j].is_solid=false;
                      }
                    }
                  }
                }
              }
              nar.addInput("String_Node_Str" + goal + "String_Node_Str");
            }
 else             if ("String_Node_Str".equals(opname)) {
              for (int i=0; i < cells.h; i++) {
                for (int j=0; j < cells.w; j++) {
                  if (cells.readCells[i][j].name.equals(goal)) {
                    if (cells.readCells[i][j].logic == Logic.SWITCH) {
                      cells.readCells[i][j].logic=Logic.OFFSWITCH;
                      cells.writeCells[i][j].logic=Logic.OFFSWITCH;
                      cells.readCells[i][j].charge=0.0f;
                      cells.writeCells[i][j].charge=0.0f;
                      nar.addInput("String_Node_Str" + goal + "String_Node_Str");
                    }
                  }
                }
              }
            }
 else             if ("String_Node_Str".equals(opname)) {
              for (int i=0; i < cells.h; i++) {
                for (int j=0; j < cells.w; j++) {
                  if (cells.readCells[i][j].name.equals(goal)) {
                    if (cells.readCells[i][j].logic == Logic.OFFSWITCH) {
                      cells.readCells[i][j].logic=Logic.SWITCH;
                      cells.writeCells[i][j].logic=Logic.SWITCH;
                      cells.readCells[i][j].charge=1.0f;
                      cells.writeCells[i][j].charge=1.0f;
                      nar.addInput("String_Node_Str" + goal + "String_Node_Str");
                    }
                  }
                }
              }
            }
            if ("String_Node_Str".equals(opname)) {
              nar.addInput("String_Node_Str" + goal + "String_Node_Str");
              active=true;
            }
          }
        }
        opname="String_Node_Str";
      }
 else {
        active=false;
        int numSteps=Math.min(10,path.size());
        float cx=x;
        float cy=y;
        for (int i=1; i < numSteps; i++) {
          PVector next=path.get(i);
          int dx=(int)(next.x - cx);
          int dy=(int)(next.y - cy);
          if ((dx == 0) && (dy == 1)) {
            turn(UP);
            forward(1);
          }
          if ((dx == 1) && (dy == 0)) {
            turn(RIGHT);
            forward(1);
          }
          if ((dx == -1) && (dy == 0)) {
            turn(LEFT);
            forward(1);
          }
          if ((dx == 0) && (dy == -1)) {
            turn(DOWN);
            forward(1);
          }
          cx=next.x;
          cy=next.y;
        }
      }
    }
  }
}