espruino bug on setWatch, digital pin.

HI,

Just found that a pushbutton on my dev board failed and I had to touch with a tweezer on its terminals to get my code to run.

setWatch(function(e) {
  print('Touched!');
}, D34, {repeat:true, edge:"falling", debounce:20});

And it very often gives me:

Guru Meditation Error of type LoadProhibited occurred on core 0.
Exception was unhandled. Register dump: PC : 0x40084912 PS
: 0x00060e33 A0 : 0x80088557 A1 : 0x3ffd7a10 A2 :
0x00000450 A3 : 0x00000000 A4 : 0xe3996419 A5 :
0x00000030 A6 : 0x3ffb2998 A7 : 0x3ffd4cd0 A8 :
0xe3996419 A9 : 0x44041563 A10 : 0x3ffb0b04 A11 :
0x00060e20 A12 : 0x0000001a A13 : 0x4013e3bb A14 :
0x3f419544 A15 : 0x00000000 SAR : 0x00000019 EXCCAUSE:
0x0000001c EXCVADDR: 0xe399641d LBEG : 0x4000c2e0 LEND :
0x4000c2f6 LCOUNT : 0xffffffff Backtrace: 0x40084912:0x3ffd7a10
0x40088554:0x3ffd7a30 0x40088595:0x3ffd7a50 0x40082ae1:0x3ffd7a70
0x4000bef5:0x3ffd7a90 0x40142760:0x3ffd7ab0 0x40141fd8:0x3ffd7ae0
0x4013e3bb:0x3ffd7b40