output: #fixed code
                                public <PSI> Iterator<Match> findAll(PSI target) throws FindFailed {
      lastMatches = null;
      Image img = null;
      String targetStr = target.toString();
      if (target instanceof String) {
        targetStr = targetStr.trim();
      }
      while (true) {
        try {
          if (autoWaitTimeout > 0) {
            RepeatableFindAll rf = new RepeatableFindAll(target);
            rf.repeat(autoWaitTimeout);
            lastMatches = rf.getMatches();
          } else {
            lastMatches = doFindAll(target, null);
          }
        } catch (Exception ex) {
          if (ex instanceof IOException) {
            if (handleImageMissing(img, false)) {
              continue;
            }
          }
          throw new FindFailed(ex.getMessage());
        }
        if (lastMatches != null) {
          return lastMatches;
        }
        if (!handleFindFailed(target, img)) {
          return null;
        }
      }
    }
input: #vulnerable code 
                                public <PSI> Iterator<Match> findAll(PSI target) throws FindFailed {
      lastMatches = null;
      Image img = null;
      String targetStr = target.toString();
      if (target instanceof String) {
        targetStr = targetStr.trim();
      }
      while (true) {
        try {
          if (autoWaitTimeout > 0) {
            RepeatableFindAll rf = new RepeatableFindAll(target);
            rf.repeat(autoWaitTimeout);
            lastMatches = rf.getMatches();
          } else {
            lastMatches = doFindAll(target, null);
          }
        } catch (Exception ex) {
          if (ex instanceof IOException) {
            if (handleImageMissing(img, false)) {
              continue;
            }
          }
          throw new FindFailed(ex.getMessage());
        }
        if (lastMatches != null) {
          return lastMatches;
        }
        if (!handleFindFailed(img)) {
          return null;
        }
      }
    } 
                              #location 28 
                              #vulnerability type NULL_DEREFERENCE