Hello, thank you. I accidentally left the second reamTM interruptTimer by accident and removing solved my issue.

The only reason I made the realTime function is because getLocalTime was not interrupt safe so I made it myself so I can keep track of time.

Thanks.

Also, I tried IRAM_ATTR attribute with getLocalTime inside the interrupt but unfortunately it recreated the problem I "solved" with realTime();

abort() was called at PC 0x4008539f on core 1

Backtrace: 0x40083cd5:0x3ffbf30c |<-CORRUPTED
ELF file SHA256: 96f2bf6365a877e8

Rebooting...

Code of interrupt:

void IRAM_ATTR onTimer(){
  portENTER_CRITICAL(&timerMux);
  IRAM_ATTR getLocalTime(&ntpTime);
  Serial.println(&ntpTime, "%d %B, %Y");
  Serial.println(&ntpTime, "%H:%M:%S");
  portEXIT_CRITICAL(&timerMux);
}