jQuery.cleanData calls on null objects (causing script breakage)

[StefanKendall]

The 'cleanData' method references a possibly null cache item and makes calls on it under certain odd edge cases. Specifically, this snippet of code in the cleanData method is at fault:

if ( id ) { data = cache[ id ]; if ( data.events ) {

In my execution, I've encountered data = null, which causes script breakage. If this is modified as such, no breakage occurs:

if ( id ) { data = cache[ id ]; if ( data && data.events ) {

I'm unsure why the cache is not populated, and this may be a separate issue entirely, but adding this guard prevents against null cache items.

[StefanKendall]

This also fails in 1.4.3pre. I've only noticed an invalid cache in IE6/7/8, but regardless, guarding against null data resolves the issue. In 1.3.2, I do not see any breakage in my application, although I haven't done any extensive testing or investigation to see if similar jQuery code paths are hit at all.

[StefanKendall]

This is fixed here: ​http://github.com/jquery/jquery/commit/f68b46d7abb54cdcd3d1ce1713bc989f992d1448#L1R564

and should be closed.

[dmethvin]

Thanks!