Yeah as per your instruction i have checked suitecrm.log and upgradeWizard.log files. but i couldn’t saw anything related to this error. Also right now in config file log level is ‘level’ => ‘fatal’.
I have checked it in three browsers Chrome, Firefox and Internet Explorer.
UpgradeWizard.log shouldn’t be relevant here. But php_errors.log is.
You’re logging level is the minimal - if you increase it to Warning or even Debug you will see many more messages. Most of them are not relevant, pay attention to the timestamps and try to see if anything looks like a clue.
If you can reproduce on the live demo I would move forward to reporting this as an Issue on github.
I have checked it with log level Debug as well as Warning. But nothing saw under suitecrm.log file. Also it’s working under demo which is provided by you. But Suitecrm version is 7.9.9 and my version is 7.9.8. So is there any issue in version 7.9.8?