Hibernian boss Colin Calderwood bemoaned his side's defensive shortcomings after they slipped to a 3-0 home defeat against Celtic.
After setting up a 44th-minute opener for Gary Hooper, who was returning from an ankle injury, ex-Hibs striker Anthony Stokes tucked in a 50th-minute penalty after he was brought down by Lewis Stevenson.
Stokes, who moved to Celtic last August after helping Hibs to fourth place last season, skilfully netted his second after 64 minutes to confirm a 15th win of the campaign.
Calderwood now has a record of two wins and eight defeats from 13 games in charge at Easter Road, with Hibs perilously close to the foot of the standings.
"It's like a spinning wheel of mistakes and we're going through the full repertoire," he said.
"The thing that makes it hard is that rotates around the players, but you accept that because we're a team. We should control that last period of the first half a lot better - the last thing you needed was the goal."