Customers at some Starbucks shops hit a snag Tuesday while trying to fill up their coffee cups, CNBC reported.
Registers were knocked offline by a technology update that was being installed overnight, the coffee chain said.
Starbucks said the glitch was affecting "a limited number of locations" in the U.S. and Canada on Tuesday morning.
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"The stores will remain open during this time and, as always, our partners are prepared to take care of our customers to ensure they have the best experience possible," the company said.
Reports on Twitter showed some patrons scoring free cups of joe at affected locations.
By the afternoon "virtually" all store were in the clear, a spokesman told The Associated Press.