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if you have a stack dump decode it: https://github.com/esp8266/Arduino/blob/master/doc/Troubleshooting/stack_dump.md

for better debug messages: https://github.com/esp8266/Arduino/blob/master/doc/Troubleshooting/debugging.md

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Hardware: ?ESP-12? Core Version: ?2.1.0-rc2?

Problem description

Module: ?Generic ESP8266 Module? Flash Size: ?4MB/1MB? CPU Frequency: ?80Mhz? Flash Mode: ?qio? Flash Frequency: ?40Mhz? Upload Using: ?OTA / SERIAL? Reset Method: ?ck / nodemcu?

#include <Arduino.h>

void setup() {

}

void loop() {

}

messages here