onSubmit script error: TypeError: Cannot read property 'getElementsByTagName' of null

[vallamreddyvenu]

Hi,

In one of our stage environments, one incident is behaving differently. when user click on save/update buttons, the user is getting below error message. It's not allowing the user to perform any action on that page. Below is the error.

I know that disabling the "Simultaneous Update Alert" client script will make it go through. But i don't want to use that as this is not happening on other incident. 

Does somebody know why it occurs and how to solve the issue.

Thanks,

Venu

[Anurag Tripathi]

Hi,

Is the isolate script flag on this set to false?

do it if not already.

-Anurag

[vallamreddyvenu]

Hi Anurag,

This has already been set to false.

Thanks,

Venu

[Hitoshi Ozawa]

It's happening because gel('onLoad_sys_updated_on') is returning null.

Separate the statement and add an if statement

var updatedOn = gel('onLoad_sys_updated_on');
if (!updateOn) {
  return;
+
updatedOn = updatedOn.value;

[Anurag Tripathi]

And put the whole thing in try catch block.