Troubled commuters were shocked to see the broken glass panel and there were concerns regarding safety.
The broken glass panel was replace hours after it was discovered.
This is the latest in a series of embarrassing problems facing SMRT’s Circle Line.
In September this year, a signalling fault led to disruptions on the line that lasted 5 days.
And a month earlier in August, commuters reported getting blasted by ice shards from the air-con units of Circle Line trains.