The mistake, spotted at the games' opening in the Malaysian capital, Kuala Lumpur, on Saturday, sparked an outcry in Indonesia and the hashtag #ShameonyouMalaysia was trending on social media.
Youth and Sports Minister Khairy Jamaluddin has apologised to his Indonesian counterpart over a mistake on the Indonesian flag in a booklet on the Kuala Lumpur SEA Games 2017.
President Joko "Jokowi" Widodo demanded an apology for hurt national pride but also cautioned against exaggerating the incident with his neighbour.
Khairy is hoping that both the Indonesian public and government will accept the apology and that the two countries will be able to continue their good relations.
Imam Nahrawi had expressed his regrets on the matter via his Twitter account yesterday and Khairy had replied through Twitter to apologise apart from stating the mistake was unintended.
INDONESIAN hackers allegedly attacked several Malaysian websites, following the flag fiasco in a guidebook produced for the 29th Sea Games, reports the BBC today.
Youth and Sports Minister Imam Nahrawi said the error was "very painful".
Ties between Malaysia and Indonesia are generally cordial, but occasional perceived slights or when cases of an Indonesian maid being abused by a Malaysian employer come to light, passions in the republic flare up.
On Twitter, Indonesians said their flag represents the sacrifices of independence heroes and accused Malaysia of either being stupid or deliberately misprinting it.
The 27 websites now show photos of the upside-down Indonesian flag as appeared in the commemorative magazine of the regional sporting event, with a message underneath them that translates to, "Our nation's flag is not a plaything".
Foreign Minister Datuk Seri Anifah Aman, in a statement, had also said Malaysia regretted the error made by the Malaysian Organising Committee (Masoc).