Nigeria’s electoral law says an election can be invalidated only if it’s proven that the Independent National Electoral Commission largely didn’t follow the law and acted in ways that could have changed the result. None of Nigeria’s presidential election results has ever been overturned by the Supreme Court.

However, the latest court challenge was unique, lawyers said, citing the legal provision that voting results must be transmitted to the electoral body’s portal.

“Having not complied with that requirement, I believe the integrity of the entire process is questionable,” said Inibehe Effiong, a lawyer in Nigeria’s capital of Abuja. No matter what the precedent shows, the court does not have other options, he added.

Separately, the Supreme Court extended the deadline until the end of the year for the government to finish switching out old currency for new bank notes. The swap has created a cash shortage because there aren’t enough redesigned notes to go around in the cash-reliant country. The crisis has stirred violence, daylong lines at banks and business closures.

A seven-member justice panel said Friday that the program’s implementation broke the law and directed the old banknotes of 200 naira (43 U.S. cents), 500 naira ($1.08) and 1,000 naira ($2.16) to stay legal tender until Dec. 31 before being replaced with the redesigned cash.