fixing hard crash in case of client disconnection
fixing hard crash in case of client disconnection

masterzen/nginx-upload-progress-module,Tiger66639/nginx-upload-progress-module,perusio/nginx-upload-progress-module,masterzen/nginx-upload-progress-module,gencer/nginx-upload-progress-module,Tiger66639/nginx-upload-progress-module,gencer/nginx-upload-progress-module,perusio/nginx-upload-progress-module