Anyone who works in the popular HBO series “Game of Thrones” needs to be careful about anything they say, in case it may be interpreted as a spoiler. This is a lesson learned by actress Natalie Dormer, who plays Queen Margaery Tyrell on the show. She accidentally dropped spoilers about Season 6 during an interview on “Jimmy Kimmel Live.”

Warning: This article contains spoilers for "Game of Thrones" Season 6.

“I’m mainly in Belfast, but I was in Spain a lot this year,” she told the host as she replied to his questions about filming for “Game of Thrones” Season 6.

The show’s official YouTube account shared a short video on Wednesday, showing part of the interview. Kimmel, who is obviously a fan of the show, called her out on the spoiler. “Was that a bit of a spoiler? Because I think you were in a dungeon the last time we saw you,” he said. [scroll down for video]

Dormer realises what she’s done, but she keeps a straight face and says that dungeons could be found in Spain as well. In Season 5, her character, Queen Margaery, was imprisoned due to an alleged cover-up of her brother’s homosexuality, a grave offence, according to the High Sparrow (Jonathan Pryce), a rougue religious leader.

Her powerful family, led by her grandmother Olenna Tyrell (Diana Rigg), is fighting hard to get her out. Cersei Lannister (Lena Headey), one of the people responsible for sending her to prison, found herself in the dungeons as well, after the High Sparrow turned against her.

Cersei managed to get out, after a scandalous and controversial “walk of atonement,” in Season 5. It remains to be seen how things will eventually play out for Queen Margaery.

Dormer admitted that just like most of the show’s fans, she is also in the dark about what will happen in the next season. She said that she does not read the other characters’ storylines so that she’s just as excited as everyone else when the show goes on air.

Meanwhile, on the delay of the publication of “Winds of Winter, Dormer isn’t worried. Author George R.R. Martin has not finished the sixth book in the series “A Song of Ice And Fire,” on which “Game of Thrones” Season 6 is supposedly based. However, Dormer said that showrunners DB Weiss and David Benioff had a long discussion with Martin and they have all collaborated on how the books and the series can arrive at the same goal.

“Game of Thrones” Season 6 premieres in April on HBO. Meanwhile, no release date has been set for "Winds of Winter.”

Watch the video below:

Source: YouTube/Jimmy Kimmel Live