Viking has suspended all cruise operations until the end of the year.
All scheduled departures up to 31 December have been cancelled.
Impacted guests will be offered a 125% future cruise credit.
Alternatively, they can also opt – no later than 24 August – for a full refund of all monies paid to date.
"If itinerary changes are required, impacted guests and their travel agents are notified directly by Viking guest services," said the line in a statement.