#vulnerable code 
                              @Override
  public boolean isDeletable() throws IOException {
    if (deletable != null) {
      return deletable.get();
    } else {
      try {
        return WatchedBoolean.get(zk, ZkPath.append(path, DELETABLE_PATH_SEGMENT));
      } catch (Exception e) {
        throw new IOException(e);
      }
    }
  } 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              @Override
  public boolean isDeletable() throws IOException {
    Boolean result;
    if (deletable != null) {
      result = deletable.get();
    } else {
      try {
        result = WatchedBoolean.get(zk, ZkPath.append(path, DELETABLE_PATH_SEGMENT));
      } catch (Exception e) {
        throw new IOException(e);
      }
    }
    if (result == null) {
      return false;
    } else {
      return result;
    }
  }