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Kill switch pedal

any AB box will work for that. "A" goes to the amp, "B" stays disconnected.

+1 to the tuner pedal being the usual choice for this job.
 
It's super-simple to build one. You'll have two jacks, in and out. Connect the "tip" terminals of the two jacks with a wire. Mount a single pole, single throw latching footswitch...run a wire from one terminal to ground, a wire from the other terminal connects to the 'tip' wire running between the jacks. When the switch is activated, the signal is tied to ground, muting the amp.

If you were to wire it so the switch opens the circuit between the amp and the bass it will hum when the killswitch is active.