Mr Kanu's case against the SSS was earlier stalled on 3 May.
The Federal High Court, Abuja, again, on Monday, adjourned a suit filed by Nnamdi Kanu, Leader of the proscribed Indigenous People of Biafra (IPOB), against the State Security Services (SSS).
The separatist leader, who the SSS is detaining, is seeking the court's order compelling the agency to allow him unhindered access to his medical doctor, among others.
Hearing of the case was stalled on 3 May due to lawyers' tardiness.
The judge, Bita Nyako, who was displeased with the lawyers' attitude, warned that she would not entertain further delays in the case. She then fixed Monday for the hearing.
But, on Monday, Ms Nykao was absent, as she was said to be away for an official assignment.
Court officials then fixed 20 June for the adoption of final addresses. Parties are expected to make their closing arguments at the June hearing, after which the judge will fix a date for judgement.
Mr Kanu sued SSS and its Director-General in the suit, which seeks a court order granting him unhindered access to his medical doctors in detention.
The SSS filed an objection against the suit, urging the court to dismiss the suit for want of jurisdiction.
It argued that there was a subsisting judgement of a sister court delivered by a now-retired judge, Taiwo Taiwo, on 3 June 2022, which, the agency said, had already issued an order allowing the IPOB leader access to his personal physician.
Sign up for free AllAfrica Newsletters
Get the latest in African news delivered straight to your inbox
The SSS said Mr Kanu's fresh case was similar to the earlier one and that the IPOB leader also had an appeal relating to the judgement pending at the Court of Appeal.
The IPOB leader, through his lawyer, Mike Ozekhome, a Senior Advocate of Nigeria, incessantly complains about his client's poor state of health in SSS custody.
Mr Kanu has a pending application at the Supreme Court seeking an order either granting him bail or transferring him to the correction centre for easy access to his lawyers and physicians.
Mr Kanu was first arrested in 2015 and was later charged over his separatist campaigns for the independent Biafra Republic, comprising mainly the Igbo-dominated South-east region.
The Court of Appeal in Abuja dismissed the charges against the IPOB leader in a judgement last year but later allowed SSS to continue detaining him, pending the federal government's appeal at the Supreme Court.
The Supreme Court has fixed 14 September for a hearing in the case.
Ms Nyako presided over the criminal trial against Mr Kanu until the charges were dismissed by the Court of Appeal last year.
