A rogue employee at US games firm ESEA illegally "mined" £2,400 of the virtual currency Bitcoins.
The company confirmed that the scam started in the middle of April and issued an apology to gamers who may have been affected.
The unnamed worker was part of an experiment to see whether Bitcoin "mining" was a feature that it wanted to include.
A company statement read: "With the whole fervour around Bitcoin, we did conduct some internal tests with the (software) client on only two of our own consenting administrators' accounts to see how the mining process worked, and determine whether it was a feature that we might want to add in the future.
"On April 13, after the initial tests, ESEA informed those involved in the test that we were killing the project and they should stop using the beta test," it added.
But it seems that one employee involved in the test continued to use the code "for his own personal gain".
"We are extremely disappointed and concerned by the unauthorised actions of this unauthorised individual," the statement added.
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