Fixed: Releasing curl handle when not connected.

nel/src/web/http_client_curl.cpp

@@ -191,8 +191,11 @@ bool CCurlHttpClient::receive(string &res, bool verbose)
 // ***************************************************************************
 void CCurlHttpClient::disconnect()
 {
-	curl_easy_cleanup(_Curl);
-	_CurlStruct = NULL;
+	if (_CurlStruct)
+	{
+		curl_easy_cleanup(_Curl);
+		_CurlStruct = NULL;
+	}
 	curl_global_cleanup();
 }