Schottky diodes up to the supply is the usual way. Put a schottky diode from the op amp input up to the supply and one from ground up to the input. The op amp has internal ESD diodes behind the input pins. One pointing from the input up to the supply and one from ground up to the input. If these start to conduct, you will leak energy into the substrate. This is where the ABS MAX conditions are derived from. The max voltage on the input is normally 0.6V above the supply voltage. This is when the diode to the positive supply starts to conduct. If you put schottky diodes at the inputs, they will bypass the internal ESD diodes and save the amp. Obviously limit the current into the Schottkys with an external resistance. Google it and it should point you in the right direction