The identity of one of the country's top spies was still accessible online after the Queensland Premier offered an assurance it had been taken down.

Key points: ASIO director-general Duncan Lewis said ASIO accepted the apology from the Queensland Government

ASIO director-general Duncan Lewis said ASIO accepted the apology from the Queensland Government Opposition Leader Deb Frecklington has called for an investigation

Opposition Leader Deb Frecklington has called for an investigation Unmasking an agent is a offence under the Australian Security Intelligence Organisation Act 1979

Annastacia Palaszczuk was forced into an embarrassing apology after The Guardian revealed the blunder and she blamed "an administrative error" for publishing the name and title of an ASIO agent in the routine release of her diary.

"It was removed," a spokesman for the Premier said on Thursday.

"We apologise and steps have been taken to ensure it doesn't happen again."

But the ABC discovered the document was still available as late as midday Friday.

Unmasking an agent is an offence under the Australian Security Intelligence Organisation Act 1979, carrying a maximum penalty of 10 years in jail.

As such, the ABC will not name the individual who accompanied ASIO director-general Duncan Lewis to the May 7 meeting with the Premier, Police Minister and then-Commissioner Ian Stewart.

The ABC has also elected not to explain how the information could be reached but other sites had already discovered the same pathway to the information.

One user of a notorious bulletin board, which the ABC has also chosen not to name, had posted the person's name and title.

ASIO director-general Duncan Lewis has accepted the Government's apology. ( ABC News: Marco Catalano )

The site has been criticised in the past for being a hub of trolls, racists, conspiracy theorists and most recently, a six-page letter from alleged Christchurch shooter Brenton Tarrant.

Opposition Leader Deb Frecklington has called for an investigation, calling the original publication an "absolute disgrace".

"A full investigation must be carried out into this farce by the Palaszczuk administration," she said.

The ABC contacted the Premier's Department about the accessibility of the document and a spokesman said the Government had been in contact with Google who assured him it was now no longer available.

'I am aware details are being shared'

Home Affairs Minister Peter Dutton declined to comment but Mr Lewis issued a statement on behalf of ASIO.

"The protection of ASIO Officers' identities is a matter of great importance to the security of our operations and of course to the individual concerned," he said.

"The recent online publication of an ASIO Officer's name in the Queensland Premier's diary documentation was an inadvertent and regrettable administrative error.

"On behalf of ASIO, I acknowledge and accept the apology from the Queensland Government.

"I understand the matter is being actively managed, and ASIO is liaising with the Queensland Government.

"To date, I note the responsible media reporting of this matter in respecting the protected status of ASIO Officers' identities.

"However, I am aware that details are being shared online and on other social media. This appears to be in breach of the criminal offence provisions of the Australian Security Intelligence Organisation Act 1979, s92."