In a post on social media, the theatre said: "Tonight's performance of Jack and the Beanstalk has been cancelled due to Covid-related issues.
"We are assessing the situation for the rest of the run and we will keep you updated."
Soon after, it posted: "Unfortunately the 10.30am performance on Thursday has also been cancelled.
"We will be in touch with all customers affected and will post further updates as soon as we know any more information."
Theatres across the country have had to cancel shows because of Covid-19 hitting cast and crew.