As usual, the answer is: it depends. When I replaced the standard burrs on my old SJ with the faster, more aggressive Duranium
burrs, I experienced several grinder stalls. This was most likely to occur when I adjusted the grind setting finer when the grinder was not running, especially with small (e.g. Yemeni) beans. This would not damage the burrs, but could damage the motor. (Or so I'm told.)
I often make small grind adjustments on my Robur without the motor running, and have not stalled the grinder yet.