TypeError: m[(m.length - 1)][0] is undefined on Frontend

I am running into an issue when trying to initiate an annotation session.

Everything on the back-end seems to be okay.

PRODIGY_LOGGING=verbose PRODIGY_ALLOWED_SESSIONS=foo,bar PRODIGY_MYSQL_MAX_LEN=16777215  prodigy rel.manual xxx en_core_web_sm dataset:foo --label foo,bar --wrap

except for potentially this warning on boot.

STREAM: Counting iterator exceeded timeout of 10 seconds after 69 tasks
17:54:10: CORS: initialized with wildcard "*" CORS origins

__  Starting the web server at ...
Open the app in your browser and start annotating!

For information:

============================== __  Prodigy Stats ==============================

Version          1.11.7    
Platform         Linux-3.10.0-1160.25.1.el7.x86_64-x86_64-with-glibc2.31
Python Version   3.9.9                         
Database Name    MySQL                         
Database Id      mysql

Are you certain that dataset:foo contains data in the right format for the rel.manual recipe? Is it possible for us to have a single example for that dataset so that we may try to reproduce it locally?