ADS1115 giving garbage values

I wanted to measure voltage with ADS1115 module. It is working perfectly on arduino uno (clone), but when I connect it to arduino pro mini (clone) it is giving one value on all channels (-101). I assume the connection must be correct, beacuse the I2c communcation is working and adress finder find's module.

#include "ADS1X15.h"
ADS1115 ADS(0x48);


void setup() {
  Serial.begin(9600);
  
  ADS.begin();
}


void loop() {

  ADS.setGain(0);
  float f = ADS.toVoltage(1);
  int16_t val1 = ADS.readADC(1);
  Serial.print(val1);
  float V = val1 * f;
  Serial.print("  ");
  Serial.println(V,2);

  delay(10);

}

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