One report refered to a "possible unscheduled overpressure event'.
I take that to mean "it might blow up".
More likely it was a warning for a larger than expected IOP (Ignition over pressure):
Liquid and solid rocket motor propulsion systems create an overpressure wave during ignition, caused by the accelerating gas particles pushing against or displacing the air contained in the launch pad or launch facility and by the afterburning of the fuel-rich gases. This wave behaves as a blast or shock wave characterized by a positive triangular-shaped first pulse and a negative half-sine wave second pulse.
Though rockets do blow up occasionally. Years ago we had a new hire that had worked in Range Safety on the early days of the Atlas/Centaur. They were blowing up launch after launch and they couldn't find a cause. Until they mounted lots of cameras inside the vehicle. On the next launch the videos showed several loose objects bouncing around. Dropped and lost tools?, nuts?, coke cans?, lunch wrappers?, who knows what was left by those rocket builders. After that the Atlas/Centaur became the most reliable rocket we've ever had.