SSRS printing report to PDF causes following error: Object reference not set to an instance of an object.

Hi I get an error when rendering report to PDF. Only happens I select all my selected groups in the filter. Appears some data somewhere is causing an issue when rendering report to PDF.

See screenshot of error
C--Users-craig.mason.METHODWARELOCAL-Doc
Can you please let me know how I can locate the problem?
Papa1NZAsked:
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Robberbaron (robr)Connect With a Mentor Commented:
generally one of the objects in your code is null.

need to put a break point on code before the error occurs,
run the app using the data selections that cause the error and then step through each line , checking each variable to get its value.

particularly, check all the values in the urlQuery NameValueCollection
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