exception and stacktrace when calling sensors.requestTemperatures();

[mysensors-6043]

Hi Community
Based on a nodeMCU the Gateway is running and passes data over the WLAN to an iobroker instance of mysensors.
There is a DS18B20 connected and temperature value can be read with the arduino IDE sample script.
The same code is inserted to the Gateway script. As soon as I call sensors.requestTemperature(), I get an exception and a stack trace.

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
float prevTemp = 0;
int sent = 0;
int numSensors=0;

void setup(void)
{
// start serial port
Serial.begin(115200);
Serial.println("Dallas Temperature IC Control Library Demo");

// Start up the library
sensors.begin();
}

void presentation() {
// Send the sketch version information to the gateway and Controller
sendSketchInfo("Temperature Sensor", "1.1");
// Fetch the number of attached temperature sensors
numSensors = sensors.getDeviceCount();
// Present all sensors to controller
for (int i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) {
present(i, S_TEMP);
}
}

void loop(void)
{
// call sensors.requestTemperatures() to issue a global temperature
// request to all devices on the bus
Serial.print(" Requesting temperatures...");
//sensors.requestTemperatures(); // Send the command to get temperatures
Serial.println("DONE");

Serial.print("Temperature for Device 1 is: ");
//Serial.print(sensors.getTempCByIndex(0)); // Why "byIndex"?
// You can have more than one IC on the same bus.
// 0 refers to the first IC on the wire

delay(1000);

}

[mysensors-6043]

Hmm, as soon as I omit including <MySensors.h> it works. I use mysensors 2.0 in Arduino IDE