output: #fixed code
                                  boolean checkBindingExist(List<Binding> bs, String file, int start, int end) {
          if (bs == null) {
              return false;
          }
  
          for (Binding b : bs) {
              if (((b.getFile() == null && file == null) ||
                      (b.getFile() != null && file != null && b.getFile().equals(file))) &&
                      b.start == start && b.end == end)
              {
                  return true;
              }
          }
  
          return false;
      }
input: #vulnerable code 
                                  boolean checkBindingExist(List<Binding> bs, String name, String file, int start) {
          if (bs == null) {
              return false;
          }
  
          for (Binding b : bs) {
              String actualFile = b.getFile();
              if (b.getName().equals(name) &&
                      actualFile.equals(file) &&
                      b.getStart() == start)
              {
                  return true;
              }
          }
  
          return false;
      } 
                              #location 9 
                              #vulnerability type NULL_DEREFERENCE