New York: Actor Domhnall Gleeson says it has become hard for him to keep the details of his upcoming film `Star Wars: Episode VII`.
Gleeson said he is terrified of accidentally revealing the spoilers of the J J Abram`s film, whose plot is kept under wraps, suggest reports.
"I become sick in my mouth when people talk about Star Wars," he joked, adding, "I`m so nervous I`m going to give something away."
Gleeson is a part of an ensemble cast along with Harrison Ford, John Boyega, Adam Driver, Andy Serkis and Oscar winner Lupita Nyong`o.
The 31-year-old actor went on to explain that there are legal restrictions that make revealing spoilers a dangerous proposition.
"You sign a massive, big, long contract thing that you don`t read. And then they send you a one-page thing that says, `Here, this is what you`re allowed to talk about`. And then there`s just a big empty page," the actor said.
"It says you`re allowed to say you`re excited to be in the movie. That`s it. That is literally all you`re supposed to talk about," he added.
`Star Wars Episode VII` opens on December 18, 2015.