excel exporter issue
excel exporter issue

Link to test case: test case behind login;
Debugger code (debug.datatables.net):
in datatables.min.js, there is this line
var o = t.header[e].length;
Error messages shown:
.length is undefined method,
Description of problem:
when table views are dynamically changed, and a column with date strings is displayed as first column, header[0] is undefined, resulting in .length not returning a value. I could take screen shots if that helps.
Answers
How are the changes being made? Assuming you mean the table data is changed then it sounds like you might not be using Datatables API's to make these changes. See this FAQ for more details.
Screenshots are typically difficult to debug. If the above doesn't help then please build a simple running test case that replicates the issues so we can see how you are making the changes and to help debug.
https://datatables.net/manual/tech-notes/10#How-to-provide-a-test-case
Kevin