Concert organizers and friends rushed Buendia to the Makati Medical Center, where he was reported to be in stable condition.
In a text message to GMANews.TV, Dok Sergio, bassist of Buendia's new band Pupil, said: "Ely is fine. Don't worry."
The Erasherheads opened the concert at 8:15 p.m. with their hit song “Alapaap" and proceeded to play classics such as “Ligaya," “Wag Mo Nang Itanong," “Fruitcake," among others.
More than 10 songs were played to eager fans at The Fort and around 9:30 p.m. the band took a 30-minute break. Forty minutes later, Buendia’s sister went up to the stage to break the sad news.
"We regret to inform you that we have to cut the concert short. My brother had to be rushed to hospital because of emotional and physical stress he is experiencing," said Buendia's sister Lali to concert-goers.
In 2007, Buendia suffered a heart attack while his new band Pupil was performing in Laguna.
The Eraserheads was a popular Pinoy rock band of the 1990s formed by Buendia, Raimund Marasigan, Buddy Zabala and Marcus Adoro.