The 15-year-old performer had introduced a chair as part of their finale routine, but it was not fixed to the ground or supported.
Luckily the teen recovered from the wobble and continued with the group’s routine on live television.
The near-fall seemed to go unnoticed by the judging panel who were full of praise for the dance troop.
However, viewers at home were left fearing for the contestant and took to social media during the break.
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F***ing hell I thought she was coming off that chair then!! #BGT
Britain's Got Talent viewer
One viewer tweeted: “OH god… heart in mouth when the chair wobbled for #MerseyGirls – could someone not have fixed it to the floor for them!! #BGT.”
“F***ing hell I thought she was coming off that chair then!! #BGT,” posted another shocked fan of the show.
A third wrote: “After she wobbled on the chair at the start of the performance they were all out of sync. Not their fault of course but it is the final. #BGT.”
“Really nice recovery from the chair wobble #MerseyGirls! Loved your act! #BGT #BritainsGotTalent2017,” posted fourth.
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“Dodgy chair almost ruined that performance! #BritainsGotTalent,” added another.
Julia’s finale performance came after it was revealed that Simon Cowell has offered to pay for her £78,000 upcoming surgery bill.
Keep up to date with our Britain’s Got Talent coverage here.