#fixed code
                                public String getScalarValue(String key) throws ConfiguratorException {
        return remove(key).asScalar().getValue();
    }
#vulnerable code 
                                public String getScalarValue(String key) throws ConfiguratorException {
        return get(key).asScalar().getValue();
    } 
                            #location 2 
                            #vulnerability type NULL_DEREFERENCE