Combinational circuits with memory unit are sequential circuits. The sequential circuits are the type of digital circuits which produce an output based on current inputs and past inputs given to the circuit upon applying the clock pulse by storing the information.

Race Around condition occurs on JK flip-flop. Basically, it is toggling of flip-flop output within a single clock pulse when both inputs of JK flip-flop are high.
To avoid Race Around condition-
1- Using Master slave JK flip-flop.
2-Clock Pulse width should be less than the propagation delay of the flip-flop.