FastCGI Error when requesting from several instances

These are all error log message:

[Sat Nov 06 08:12:35.116781 2021] [-:error] [pid 90288:tid 34402912768] [client 2a00:d4a0:2:6b00:9ddd:907e:361:f050:60951] FastCGI: server "/var/run/hcgi/90232" stderr: PHP Fatal error:  Uncaught Error: Call to a member function toArray() on bool in /home/ufesodoc/www/ufesodoc.myhostpoint.ch/wp-content/plugins/license-manager-for-woocommerce/includes/api/v2/Licenses.php:792
[Sat Nov 06 08:12:35.116845 2021] [-:error] [pid 90288:tid 34402912768] [client 2a00:d4a0:2:6b00:9ddd:907e:361:f050:60951] FastCGI: server "/var/run/hcgi/90232" stderr: #1 /home/ufesodoc/www/ufesodoc.myhostpoint.ch/wp-includes/rest-api/class-wp-rest-server.php(987): WP_REST_Server->respond_to_request(Object(WP_REST_Request), '/lmfwc/v2/licen...', Array, NULL)
[Sat Nov 06 08:12:35.116863 2021] [-:error] [pid 90288:tid 34402912768] [client 2a00:d4a0:2:6b00:9ddd:907e:361:f050:60951] FastCGI: server "/var/run/hcgi/90232" stderr: #3 /home/ufesodoc/www/ufesodoc.myhostpoint.ch/wp-includes/rest-api.php(370): WP_REST_Server->serve_request('/lmfwc/v2/licen...')
[Sat Nov 06 08:12:35.116872 2021] [-:error] [pid 90288:tid 34402912768] [client 2a00:d4a0:2:6b00:9ddd:907e:361:f050:60951] FastCGI: server "/var/run/hcgi/90232" stderr: #4 /home/ufesodoc/www/ufesodoc.myhostpoint.ch/wp-includes/class-wp-hook.php(303): rest_api_loaded(Object(WP))
[Sat Nov 06 08:12:35.116835 2021] [-:error] [pid 90288:tid 34402912768] [client 2a00:d4a0:2:6b00:9ddd:907e:361:f050:60951] FastCGI: server "/var/run/hcgi/90232" stderr: #0 /home/ufesodoc/www/ufesodoc.myhostpoint.ch/wp-includes/rest-api/class-wp-rest-server.php(1140): LicenseManagerForWooCommerce\\API\\v2\\Licenses->deactivateLicense(Object(WP_REST_Request))
[Sat Nov 06 08:12:35.116881 2021] [-:error] [pid 90288:tid 34402912768] [client 2a00:d4a0:2:6b00:9ddd:907e:361:f050:60951] FastCGI: server "/var/run/hcgi/90232" stderr: #5 /home/ufesodoc/www/ufesodoc.myhostpoint.ch/wp-incl in /home/ufesodoc/www/ufesodoc.myhostpoint.ch/wp-content/plugins/license-manager-for-woocommerce/includes/api/v2/Licenses.php on line 792
[Sat Nov 06 08:12:35.116826 2021] [-:error] [pid 90288:tid 34402912768] [client 2a00:d4a0:2:6b00:9ddd:907e:361:f050:60951] FastCGI: server "/var/run/hcgi/90232" stderr: Stack trace:
[Sat Nov 06 08:12:35.116854 2021] [-:error] [pid 90288:tid 34402912768] [client 2a00:d4a0:2:6b00:9ddd:907e:361:f050:60951] FastCGI: server "/var/run/hcgi/90232" stderr: #2 /home/ufesodoc/www/ufesodoc.myhostpoint.ch/wp-includes/rest-api/class-wp-rest-server.php(414): WP_REST_Server->dispatch(Object(WP_REST_Request))

Hello @arsalantariq,

Sorry for the delay!

Exactly this happens when I try to activate or deactivate the same licence at the same time from different instances. There are scenarios, where the C# code bellow is executed from several instances at the same time and sending activation or deactivation requests on the same license. I suppose, there is something wrong with DB lock? Otherwise, activate or deactivate works as it should.

        private void getLicense(String Path)        
        {            
            // Check Licence Key
            String json_str = "";
            System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
            WebRequest req = WebRequest.Create(Path + p_licence_key);
            req.Timeout = 30*1000;            
            req.Method = "GET";
            req.Headers["Authorization"] = "Basic " + Convert.ToBase64String(Encoding.Default.GetBytes("ck_5a36306960a962504f560d05062c79c8be3dcaa4:cs_0a9fd7286af43193a66321b359d0ce538fa8882c"));
            req.Credentials = new NetworkCredential("ck_5a36306960a962504f560d05062c79c8be3dcaa4", "cs_0a9fd7286af43193a66321b359d0ce538fa8882c");                          

            try{
                HttpWebResponse resp = req.GetResponse() as HttpWebResponse;
                StreamReader reader = new StreamReader(resp.GetResponseStream());                      
                string str = reader.ReadLine();                    
                while(str != null)  
                {                  
                    json_str = json_str + (str.Substring(0,str.Length));  
                    str = reader.ReadLine();                                                
                }
                
                license = JsonConvert.DeserializeObject<License>(json_str);                
                licenseExpirationDate = DateTime.Parse(license.Success_Data.ExpiresAt.DateTime.ToString());                
            }
            catch (Exception ex){
                Print(ex);
                Print("License key error: ", p_licence_key);
                Stop();
            }                
        }