Can't serialize Docs created with spacy-transformers

code.py

from spacy.cli import download
from spacy.tokens import DocBin

# Load the spaCy transformers model based on English web content
download("en_core_web_trf")
# download("en_core_web_lg")
nlp = spacy.load("en_core_web_trf")

# Store the documents of the articles because the transformer model is slow
doc_bin = DocBin(attrs=["LEMMA", "ENT_IOB", "ENT_TYPE"], store_user_data=False)

# Text is in the 'body' field
articles, docs, sentences = [], [], []
with bz2.open("/path/to/file/foo.json.bz2") as f:
    for line in tq.tqdm(f.readlines()):

        article = json.loads(line.rstrip())
        articles.append(article)
        
        doc = nlp(article["body"])
        docs.append(doc)

        # Add so it can be serialized
        doc_bin.add(doc)
    
        sents = [sent.text.strip() for sent in doc.sents if len(sent) > 3]
        sentences += sents

exception.py

✔ Download and installation successful
You can now load the package via spacy.load('en_core_web_trf')
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---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-6-236a13821dcd> in <module>()
     22 
     23         # Add so it can be serialized
---> 24         doc_bin.add(doc)
     25 
     26         sents = [sent.text.strip() for sent in doc.sents if len(sent) > 3]

7 frames
/usr/local/lib/python3.6/dist-packages/srsly/msgpack/_packer.pyx in srsly.msgpack._packer.Packer._pack()

TypeError: can not serialize 'TransformerData' object