IE SP2 bound error: null is null or not an object

[putty]

I've seen a few references to the "null is null" error but they were
all from clients, my question is javascript programming specific.

I've made a little "AJAX"-style GUI that works just fine in IE6 SP1 and
Firefox, but breaks in IE6 SP2 with a "null is null" error. I don't
have SP2 installed so I can't trace the error, not to mention IE's
error messages are faily useless when your code is factored across
multiple .js files.

What changed in IE SP2 that would cause "AJAX" related javascript to
break?

I'm not creating any popups; everything on the page is done using
movable divs with async event callbacks via XMLHTTP. I also do some
memory leak prevention (which works damn well in IE SP1) with managed
event unbinding.

I know this is shooting in the wind but maybe some other javascript
coder here has come across this error and why it's only caused in IE
SP2.

-- putty

 

[putty]

I figured out what the change in IE6 SP2 was that would break my
JavaScript.
Unlike IE6 SP1, in SP2 rows /must/ be inserted into tBodies instead of
Tables directly.

Attempting to insertCell() into an improperly inserted row would result
in the "null is null or not an object" error.

-- putty