New York Laws
Article 4 - Security for Compensation
55 - Acceptance of Premium by Carrier an Estoppel.

ยง 55. Acceptance of premium by carrier an estoppel. Acceptance of a
premium on a policy securing to an employee compensation, either alone
or in connection with other insurance, shall estop the carrier so
accepting from pleading that the employment of such employee is not a
hazardous employment or the employment is not carried on for pecuniary
gain.