English to French Bus/Financial Cinema, Film, TV, Drama assurance production cinématographique

Clause dans le contrat de distribution d'un film :

Should the production or Delivery of the Picture be hampered, interrupted or interfered with by reason of the unavailability for any reason of the star(s) and/or director, the death or incapacity of any actor or the director or their inability to qualify for cast insurance, fire, flood, casualty, lockout, strike, * labor condition *, unavoidable accident, national calamity, mechanical or other breakdown of electrical or sound equipment, failure or delay on the part of any laboratory or supplier, delay in or lack of transportation, etc... [phrase coupée, très longue]

Quel est le sens exact de labour condition associé à un risque à couvrir ? S'agit-il d'un conflit de travail (labour dispute habituellement) ou d'autre chose ?