Merge pull request #2050 from overleaf/bg-fix-session-logging-error

fix error in session logging

GitOrigin-RevId: e31ac3585f4c502a04602e9a49445319502c5d52

services/web/app/src/infrastructure/Server.js

@@ -151,7 +151,9 @@ webRouter.use(function(req, res, next) {
     UserSessionsManager.touch(
       AuthenticationController.getSessionUser(req),
       err => {
-        logger.err({ err }, 'error extending user session')
+        if (err) {
+          logger.err({ err }, 'error extending user session')
+        }
       }
     )
   }