Core 0 panic'ed Error when pressing buttons attached to GPIO PINS

Hiya,

I have this simple piece of code:

console.log('HELLO');
console.log(process.memory());

pinMode(D16, 'input_pullup');
pinMode(D17, 'input_pullup');
pinMode(D18, 'input_pullup');
pinMode(D19, 'input_pullup');

console.log(process.memory());

const options = {
  repeat: true,
  debounce: 100
};

setWatch(e => {
  //{state:bool, time:float, lastTime:float}
  const state = e.state;
  console.log('D16 -> state:', state);
  console.log(process.memory());
}, D16, options);

setWatch(e => {
  //{state:bool, time:float, lastTime:float}
  const state = e.state;
  console.log('D17 -> state:', state);
  console.log(process.memory());
}, D17, options);

setWatch(e => {
  //{state:bool, time:float, lastTime:float}
  const state = e.state;
  console.log('D18 -> state:', state);
  console.log(process.memory());
}, D18, options);

setWatch(e => {
  //{state:bool, time:float, lastTime:float}
  const state = e.state;
  console.log('D19 -> state:', state);
  console.log(process.memory());
}, D19, options);

Randomly when one of the buttons is pressed I get this error:

>Guru Meditation Error: Core  0 panic'ed (StoreProhibited). Exception was unhandled.
Core 0 register dump:
PC      : 0x40096496  PS      : 0x00060c33  A0      : 0x80095952  A1      : 0x3ffb7590
A2      : 0x800888c3  A3      : 0x0000cdcd  A4      : 0x00060c20  A5      : 0x00000001
A6      : 0xb33fffff  A7      : 0x00000000  A8      : 0x0000abab  A9      : 0x0000cdcd
A10     : 0x00000003  A11     : 0x00060c23  A12     : 0x00060c20  A13     : 0x00000000
A14     : 0x3ffb63ec  A15     : 0x3ffb9a20  SAR     : 0x00000000  EXCCAUSE: 0x0000001d
EXCVADDR: 0x800888c3  LBEG    : 0x400924b4  LEND    : 0x400924d0  LCOUNT  : 0xffffffff
ELF file SHA256: 0000000000000000
Backtrace: 0x40096493:0x3ffb7590 0x4009594f:0x3ffb75c0 0x400d0a4a:0x3ffb7600 0x400859b6:0x3ffb7620 0x400e744b:0x3ffb7650 0x400d4a35:0x3ffb7670 0x400d0bf0:0x3ffb7690
Rebooting...
ets Jun  8 2016 00:22:57
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:2984
load:0x40078000,len:10700
load:0x40080400,len:5236
entry 0x40080658
E (561) psram: PSRAM ID read error: 0xffffffff
E (561) spiram: SPI RAM enabled but initialization failed. Bailing out.
E (562) spiram: SPI RAM not initialized
Guru Meditation Error: Core  0 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x400889a4: 782c7420 1dc1b827 000000f0
Core 0 register dump:
PC      : 0x400889ab  PS      : 0x00060130  A0      : 0x000002a3  A1      : 0x3ffbe850
A2      : 0x00000028  A3      : 0x00020000  A4      : 0x00000000  A5      : 0x400978b4
A6      : 0x000c1aa3  A7      : 0x00000000  A8      : 0x00000027  A9      : 0x00000000
A10     : 0x00000027  A11     : 0x00000040  A12     : 0x00000012  A13     : 0xc1aa0000
A14     : 0xf4240000  A15     : 0x0000a890  SAR     : 0x0000000c  EXCCAUSE: 0x00000000
EXCVADDR: 0x00000000  LBEG    : 0x4009ae9c  LEND    : 0x4009aea7  LCOUNT  : 0x00000000
Core 0 was running in ISR context:
EPC1    : 0x400889ab  EPC2    : 0x00000000  EPC3    : 0x00000000  EPC4    : 0x00000000
ELF file SHA256: 0000000000000000
Backtrace: 0x400889a8:0x3ffbe850 0x000002a0:0x3ffbe870 |<-CORRUPTED
Rebooting...

And it just goes into a loop and keeps printing this out. Using this Firmware: espruino_2v18_esp32

Any ideas?