A halt in data feed that prevented prices for Nasdaq OMX Group Inc.’s benchmark U.S. stock indices from being published from almost an hour yesterday was due to human error, the company said.

The Nasdaq Composite Index and Nasdaq-100 Index were among the measures that stopped updating yesterday at 11:53 a.m. New York time and did not move again until 12:45 p.m. the same day. According to Nasdaq the system that disseminates data was fixed at 12:37 p.m. Some individual stocks listed by Nasdaq OMX, such as Apple Inc. (AAPL) and Google Inc. (GOOG), continued to trade during the outage.

“The disruption was caused by a human error performing an operational function which resulted in the incorrect delivery of data to the index distribution system,” Ryan Wells, Nasdaq spokesman, said in an e-mailed statement.

Although yesterday’s problem was confined to data dissemination alone without affecting any stocks, it is only the latest in a series of high-profiles glitches that have disrupted operations at the second-largest U.S. exchange operator for over a year. A software malfunction on 22nd August, in fact, at another Nasdaq OMX data feed stopped trading for thousands of U.S. stocks, which a software error at Nasdaq OMX delayed Facebook Inc.’s first day of trading on 18th of May last year.