According to me, and logical.
Bonus is part of CTC. as long as it has mentioned in Fixed cost, employer is bound to pay the same, even it's loss to the company (considering bonus act).
I had discussed with labour commisioner in mumbai, according to him as long as it's been paid to employee regularly, and recorded in the payment register duly signed by employee, it's should not have any issue.
Regards,
Nilesh C B