output: #fixed code
                                  @Override
      public void parse(TokenizedSource source, ParserInfo info) {
          PandaScript script = info.getComponent(Components.SCRIPT);
          TokenReader reader = new PandaTokenReader(source);
  
          Extractor extractor = PATTERN.extractor();
          List<TokenizedSource> gaps = extractor.extract(reader);
  
          if (gaps == null) {
              throw new PandaParserException("Cannot parse expression::instance");
          }
  
          String className = gaps.get(0).asString();
          ImportRegistry importRegistry = script.getImportRegistry();
          this.returnType = importRegistry.forClass(className);
  
          if (returnType == null) {
              throw new PandaParserException("Unknown return type '" + className + "'");
          }
  
          ArgumentParser argumentParser = new ArgumentParser();
          this.arguments = argumentParser.parse(info, gaps.get(1));
          this.constructor = ConstructorUtils.matchConstructor(returnType, arguments);
  
          if (constructor == null) {
              throw new PandaParserException("Cannot find " + className + " constructor for the specified arguments");
          }
      }
input: #vulnerable code 
                                  @Override
      public void parse(TokenizedSource source, ParserInfo info) {
          PandaScript script = info.getComponent(Components.SCRIPT);
          TokenReader reader = new PandaTokenReader(source);
  
          Extractor extractor = PATTERN.extractor();
          List<TokenizedSource> gaps = extractor.extract(reader);
  
          if (gaps == null) {
              throw new PandaParserException("Cannot parse expression::instance");
          }
  
          String className = gaps.get(0).asString();
          ImportRegistry importRegistry = script.getImportRegistry();
          this.returnType = importRegistry.forClass(className);
  
          ArgumentParser argumentParser = new ArgumentParser();
          this.arguments = argumentParser.parse(info, gaps.get(1));
          this.constructor = ConstructorUtils.matchConstructor(returnType, arguments);
  
          if (constructor == null) {
              throw new PandaParserException("Cannot find " + className + " constructor for the specified arguments");
          }
      } 
                              #location 19 
                              #vulnerability type NULL_DEREFERENCE