Irish teenager Ibrahim Halawa has gone off hunger strike due to heart problems.
Ibrahim had been on hunger strike after his mass trial collapsed on August 17.
The judge walked out of court and refused to continue with the hearing.
The Firhouse native faces charges along with hundreds of others in Egypt over protests at Cairo's Al-Fath mosque following the ousting of former president Mohammed Mursi last year.
Ibrahim could face the death penalty if he is convicted but is now waiting for a new trial date.
He was just 17 when he was thrown into jail in August last year but has since celebrated his 18th birthday in the notorious Tora prison.
His sister Somaia told the Herald that she was worried about her little brother going on hunger strike because of his existing heart condition but that Ibrahim felt it was "his last resort".
She also said that Ibrahim was drinking water just once a day while on hunger strike but that the water quality is extremely bad and not fit for human consumption.
Somaia (28) was also detained at the same time as Ibrahim, along with her sisters Fatima (23) and Omaima (21). The three sisters were released last November.