Error when calling exec_request

[RSHum23]

elsapy\elsclient.py:109, in ElsClient.exec_request(self, URL)
    107 if self.inst_token:
    108     headers["X-ELS-Insttoken"] = self.inst_token
--> 109 logger.info('Sending GET request to ' + URL)
    110 r = requests.get(
    111     URL,
    112     headers = headers
    113     )
    114 self.__ts_last_req = time.time()

TypeError: can only concatenate str (not "int") to str

logger.info('Sending GET request to ' + URL) should be changed into logger.info('Sending GET request to ' + str(URL))