(CNN) - Starbucks said a computer outage crippled some of its stores in the U.S. and Canada on Tuesday.
The outage happened after the company ran a regular technology update on cash registers overnight.
A Starbucks spokesman said the chain was not compromised by a cyberattack and that technology updates can be tricky.
Customers across the U.S. tweeted about the problems.
Some said baristas were accepting cash only, while others were handing out free coffee to make up for the problems.
Starbucks would not say how many of its stores were affected or how many were still offline Tuesday afternoon.
All they said was that it was a "limited number" and the company was trying to fix it.
There are about 14,500 Starbucks stores in the U.S. and Canada.
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