Parsing String values crashes ESP8266

Created by: JeffAshton

Also noticing on the ESP8266, that parsing anything but a statically defined const char*, kills the parser.

#include <ArduinoJson.h>

void setup() {

  Serial.begin( 115200 );
  delay( 10 );
  Serial.println( "" );

  StaticJsonBuffer<200> jsonBuffer;

  String json = "{\"mqtt.host\":\"mqtt.test.com\",\"mqtt.port\":1883}";

  Serial.println( "Parsing json string" );
  JsonObject& root = jsonBuffer.parseObject( json );

  if( root.success() ) {
    Serial.println( "parsed" );
  } else {
    Serial.println( "failed" );
  }
}

void loop() {
}

Results in

Parsing json string

Exception (9):
epc1=0x402021cd epc2=0x00000000 epc3=0x00000000 excvaddr=0x3ffe9d67 depc=0x00000000

ctx: cont 
sp: 3ffe9b40 end: 3ffe9e30 offset: 01a0

>>>stack>>>
3ffe9ce0:  3fffdc20 00000013 3ffe8de4 402039a9  
3ffe9cf0:  3ffe8968 00000000 3ffe8de4 3ffe9e5c  
3ffe9d00:  3fffdc20 00000000 3ffe8de4 40202216  
3ffe9d10:  3ffe9d30 3ffe9d34 3ffe9d34 4020450a  
3ffe9d20:  3fffdc20 00000000 3ffe8de4 4020214e  
3ffe9d30:  3ffe8878 716d227b 682e7474 2274736f  
3ffe9d40:  716d223a 742e7474 2e747365 226d6f63  
3ffe9d50:  716d222c 702e7474 2274726f 3838313a  
3ffe9d60:  00007d33 00000000 00000000 00000000  
3ffe9d70:  00000000 00000000 00000000 00000000  
3ffe9d80:  00000000 00000000 00000000 00000000  
3ffe9d90:  00000000 00000000 00000000 00000000  
3ffe9da0:  00000000 00000000 00000000 00000000  
3ffe9db0:  00000000 00000000 00000000 00000000  
3ffe9dc0:  00000000 00000000 00000000 00000000  
3ffe9dd0:  00000000 00000000 00000000 00000000  
3ffe9de0:  00000000 00000000 00000000 00000000  
3ffe9df0:  00000000 00000000 00000000 00000037  
3ffe9e00:  3fff38a8 0000002e 0000002e 00000000  
3ffe9e10:  00000000 00000000 3ffe9e54 40201a07  
3ffe9e20:  00000000 00000000 3ffe8e10 40100378  
<<<stack<<<