Feel the outside of the bowl. It could be one of two reasons:u003cbr/u003eu003cstrongu003e1. u003cemu003eThe bowl feels cold to the touchu003c/emu003e.u003c/strongu003e Allow your buttercream to warm up at room temperature for 10 minutes. Continue whipping again.u003cbr/u003eu003cstrongu003eu003cemu003e2u003c/emu003e. u003cemu003eThe bowl feels warm to the touch.u003c/emu003eu003c/strongu003eu003cemu003e u003c/emu003ePop the mixing bowl in the fridge for 10 minutes to cool down. Continue whipping again.