Google on Thursday blamed a “data error” after users reported that former President Joe Biden was missing from the company’s search results.

Users on Wednesday noticed that results for search queries that included “US Presidents,” “United States Presidents” and “US Presidents in order” did not include Biden, who concluded his four-year presidential term on Monday. Users reported seeing a list of presidents ranging from George Washington to President Donald Trump. Some users posted screenshots of their results showing how the lists omitted Biden.

CNBC tried searching for U.S. presidents on Wednesday night and also encountered the results that omitted Biden. The company restored Biden to its results on Thursday.