Error in 15.1.9 cannot read property set of null

[PDSBILL]

I'll see what I can find. We can possibly avoid the JS error from IW side, but not sure if whatever the grid is doing in async will work

OK,  I found it.  The last programmer added

ExtraHeader.Add('<script type="text/javascript">function findCssRuleInCache(selectorName) {return null};</script>');

I commented this out and everything now works. I assume this was added to correct an issue in prior Intraweb Version.