Lookup data including symbols

if the entity name that we save in lookup file is containing symbols like ( ) - [ ] , it is not being recognized as an entity from user input. For example , if the entity value for the slot “name” in lookup file is xyz (abc) ; then if the user inputs - "whats the id of xyz (abc) " ; then the following error is obtained : TypeError: must be str, not NoneType . How can I resolve this ?

the parenthesis are scrapped in whitespace tokenizer here: rasa/whitespace_tokenizer.py at a3e329efd16032c900900181dcf57b01884e1a97 · RasaHQ/rasa · GitHub