Starbucks fans nationwide took to social media Tuesday morning after an apparent software glitch left thousands of stores unable to process payments.

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A sign posted outside a Starbucks in Covina, California, said a computer outage left employees unable to process customer transactions.

Outside a Starbucks in El Paso, Texas, a sign posted by employees said a “national outage” meant baristas could serve only a limited menu.

“You may need cash to pay today,” KFOX reporter Amy Licerio wrote in a tweet of the sign.