Presiding judge Tomas Kubec ruled that Randy Blythe's actions did not constitute the crime of causing an injury leading to death.
"We did not find criminal responsibility in the actions of the defendant," he said. "We found moral responsibility. There has been the death of a young man who had not been guilty of anything."
Kubec said the concert promoters were ultimately to blame for failing to prevent fans from clambering onto the stage.
"We reached the conclusion that there was a serious fault on the side of the promoter and organiser of the concert."
Prosecutors immediately appealed against the acquittal, meaning that the case will be reviewed by the Czech High Court.
More top news
Austin Powers star Verne Troyer has died aged 49, his official social media accounts have confirmed.The diminutive US actor, best known for
Commons Business Committee warns exports will be hit and prices will rise if Britain reverts to WTO rules.
The Labour leader accused the PM of setting a ‘deliberately unreachable bar’ for migrants.