This site was built to compliment the existing NetSuite Professionals Slack Community by adding a means for members to easily find answers to common questions and to create a searchable database of those questions and answers.

NetSuite Professionals

Getting a lot of these errors which is causing an issue with a suitelet. Has anyone seen this before?
```ResourceTiming.js:33 Uncaught TypeError: Cannot read property 'length' of undefined
    at Performance.NLRUM.onRestimingBufferFull (ResourceTiming.js:33)```

it just simply says that whatever that variable that you get the length to is having a undefine value.

Try to check first if that variable return any

it's NS code, not mine. I understand the error, just curious if anyone else has seen it before I put a case in. they're assuming the arrays are valid before checking the length

```NLRUM.onRestimingBufferFull = function() {
	if (NLRUM.bResourceTimingDataCollection &gt; 0)
	{
		if (NLRUM.pendingActions.length &gt; 0 || NLRUM.actionEntries.length &gt; 0 || (Object.keys(NLRUM.pendingBrowserEntry).length &gt; 0 &amp;&amp; NLRUM.pendingBrowserEntry.resourceMatchEndTime &amp;&amp; NLRUM.pendingBrowserEntry.resourceMatchEndTime &gt; Date.now()))
		{
			NLRUM.resourceMapping();
		}
		else
		{
			NLRUM.sendResTiming();
			NLRUM.clearResourceTimings(true);
		}
	}
};```

NS isn't very good at validating inputs to their internal code. I'd try and track the stack trace back to what _is_ your code and dig in to see of anything is awry at that stack frame.

There are no exceptions in my code before this is thrown, and I'm certainly not trying to modify those arrays. The error is thrown on a mousewheel event as well.

This was caused by uBlock Origin (chrome extension).