Bug: JSON.parse(undefined) reboots the ESP8266

(argh, forum ate a longer response, so just a short answer now:)

Works on my machine :)

My machine now includes ESP8266, ESP32, nRF52. JSON.parse(undefined) doesn't cause a reboot.
Most likely some other code either in the init or in the "regular" part of your program that causes a reboot. Some other error, or stuck in an infinite loop waiting for something that never happens because init failed (and rebooted by watchdog).

Even tried this on an ESP8266 (with save to flash)

function onInit(){
  print('@onInit');
  //throw new Error('b00');
  JSON.parse(undefined);
}

Output:

 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v01 (c) 2018 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
Flash map 4MB:1024/1024, manuf 0xef chip 0x4016
>
Running onInit()...
@onInit
Uncaught SyntaxError: Expecting a valid value, got undefined
 at line 1 col 10
undefined
         ^
in function called from system

And works just fine.