BNP London Assembly Member Richard Barnbrook failed to attend the Standards Hearing into his conduct today due to a "stress related illness."
Mr Barnbrook, who is facing a possible six month suspension, sent a doctors note to Dagenham Civic Centre excusing him from attendance for up to two weeks.
The joint investigation into his conduct earlier this year found that he had clearly broken the GLA and local authority codes of conduct.
The investigation was launched after he posted a video online referring to murders that had never happened.
When questioned about the video, he admitted that he knew his claims to be false, but insisted that it "made little difference" whether the murders had taken place.
He also refused to take down the videos, saying that they “would be removed in 4-6 weeks anyway.”
The committee was due to meet today to review the investigation and to decide what sanctions should be taken.
Sanctions for breaking the code range from the requirement to make a formal apology to full suspension.
Representatives of the GLA, Barking and Dagenham council, and the Metropolitan Police were forced to adjourn the hearing after receiving the doctor's note earlier this morning.
Mr Barnbrook who was to be represented by BNP spokesman Lee Barnes, had previously failed to submit evidence to the joint standards committee.
A spokesperson for Barking and Dagenham Council said that he was also contesting its membership.
Two preliminary dates were set for a new hearing on either 12th August or 4th September.
The chair of the Committee Claer Lloyd-Jones said the hearing would proceed on those dates "unless something extraordinary happens"