Hi I have problem with school project. I have 3 Arduino - 1 Transmiter with NRF; 2,3 - NRF receiver and wire slave receiver. I can't send data via "Wire" library (in code char "datar") to receiver arduino. I won't get anything, but when I want to send like Wire.write("blablabla"); it pass. But when in char is NRF data code crashing when go to "Wire.write".

/*
*/
#include <Wire.h>
#include <SPI.h>
#include "RF24.h"

char datar = '';

//Konfiguracja
const uint64_t pipes[2] = {0xF1F2F3F0F7/*odbieranie*/, 0xF1F2F3F0F8/*wysylanie*/};
RF24 radio(9, 10); //Piny nrf (SPI) 9 i 10
//-- Konfiguracja

void setup() {
  Serial.begin(9600);
  Serial.println("LOL");
  Wire.begin();
  radio.begin();
  radio.setPALevel(RF24_PA_MAX);
  radio.setDataRate(RF24_250KBPS);
  radio.openReadingPipe(1, pipes[0]);
  radio.openWritingPipe(pipes[1]);
  radio.setChannel(78);
  radio.setAutoAck(true); 
  radio.startListening();
}


void loop() {
 
  int len; 
  if(radio.available())
  {
  len = radio.getDynamicPayloadSize();
  radio.read(&datar, len);
  delay(5);
  Serial.println(datar);
  Wire.beginTransmission(7);
  Wire.write(&datar);
  Wire.endTran345smission();
  radio.printDetails();
  }
  delay(5);
  

}