Possibility of Broker's Default

In this panic, Is there any possibility of a broker getting bankrupt/default? How to make sure that our free cash in brokers’s account (apart from holding) is safe?
if yes, then how to make our money safe? Should we withdraw our free cash?

Please take a look at this post.

Than you but this is all about money comes from pledged shares with a broker. It doesn’t tell about free money lies in the broker’s accounts.
@nithin @Bhuvan please tell me more about what if a broker gets bankrupt or defaults what will be the fate of money lies in its account as free cash (ie money in Zerodha’s fund)?
Equities in holdings are in depositories so they are safe but what about this free cash?

Answered here