Steidl Verlag, one of the most beloved publishers of photobooks, is facing preliminary insolvency proceedings in Germany, according to reports in the German media.

NDR reports that insolvency proceedings were opened on Friday in a court in Göttingen at the request of a creditor. A court is also reviewing claims that the publishing house did not pay salaries to employees or delayed “a considerable amount” of payment—as much as five or six months’ worth in some cases, according to a lawyer who spoke to Die Welt.