Cannot read property parentNode of null

Hi,

Maybe we're doing something wrong, but when having multiple datatables in the page (some of them hidden in tabs) we get exceptions in the following lines of codes.

Original line of code:
if ( s.nTable == this || s.nTHead.parentNode == this || (s.nTFoot && s.nTFoot.parentNode == this) )

Code after we "fixed" it:
if ( s.nTable == this || (s.nTHead && s.nTHead.parentNode == this) || (s.nTFoot && s.nTFoot.parentNode == this) )

Original line of code:
aDataSort = aoColumns[ srcCol ].aDataSort;
Code after we "fixed" it:
if (aoColumns[ srcCol ] == null)
continue;
aDataSort = aoColumns[ srcCol ].aDataSort;

Some technical information:
1. We have an angular directive We wrote for datatable.
2. We are using datatable version 1.10.9
3. We use the following extensions and plugins (not where we get the exception, but they are included in the page sources):
buttons
select
colReorder
rowReorder
fixedColumns
fixedHeader
bootstrap
editor
editor.bootstrap
columns.filter
buttons.flash
buttons.html5
buttons.print
jzip
pdfmake
vfs_fonts

Are we doing something wrong?
Many thanks,
Yishay