'I Can't Sing' ended mid-show last night due a technical problem.
'The X Factor' musical, held at the London Palladium theatre, was plagued by a "major electrical fault" and the entire second act was abandoned, reports Digital Spy.
The audience - including 'Britain's Got Talent' judge Amanda Holden - faced a 45-minute delay after the interval before director Sean Foley came onstage to inform the audience the show wouldn't go on.
Producers offered a refund for any tickets purchased, or alternatively, an exchange to see the musical on a different night.
Last month, the opening night of 'I Can't Sing' - which was written by comedian Harry Hill and is produced by 'X Factor' creator Simon Cowell - was delayed twice due to technical problems.
The musical pokes fun at the ITV singing competition and features caricatures of the show's famous faces, including Nigel Harman portraying judge Simon Cowell.
Louis Walsh, returning judge Cheryl Cole and host Dermot O'Leary are also spoofed in the theatre show.
Producers recently cut a line mocking theatre mogul Sir Andrew Lloyd Webber's recent musical, 'Stephen Webber', so as not to offend him as he owns the London Palladium.
A source said: "They didn't want to run the risk of upsetting him. After all, he does own the Palladium. Lloyd Webber is blissfully unaware."
Tagged in Amanda Holden Harry Hill Simon Cowell