SEN0521 Compilation error in Arduino IDE

SEN0521 Arduino IDE

I get an error during compilation, can someone help me?

I use the Github Robbike/DFRobot_Microwave_Radar_Module 
 

C:\SEN0521_radar_measurement\examples\DFRobot_Microwave_Radar_Module.cpp: In member function 'bool DFRobot_Microwave_Radar_Module::readDone()':
C:\SEN0521_radar_measurement\examples\DFRobot_Microwave_Radar_Module.cpp:86:30: error: ordered comparison of pointer with integer zero ('char*' and 'int')
  86 |     if (strstr(Data, "Done") > 0) {
     |         ~~~~~~~~~~~~~~~~~~~~~^~~
exit status 1

Compilation error: ordered comparison of pointer with integer zero ('char*' and 'int')