Encoding input string with quotes

[kdujmic]

private final String encodingExampleWithQuotes = "Hello my name is "Kevin".";

When testing with a string that has quotes I get error.

    GPT2Tokenizer tokenizer = GPT2Tokenizer.fromPretrained("tokenizers/gpt2");
    List<Integer> result = tokenizer.encode(encodingExampleWithQuotes);
    Assertions.assertEquals(decodingExampleWithQutes, result);

java.lang.NullPointerException: Cannot invoke "java.math.BigInteger.intValue()" because the return value of "java.util.Map.get(Object)" is null