Getting error when exporting reports

Hi,
when I export a report from katalon. i get the below error.Actually i trying to export a summary report of 250 test cases.

An internal error occurred during: “Export test suite report”.
com.fasterxml.aalto.WFCException: Illegal character (NULL, unicode 0) encountered: not valid in any content
at [row,col {unknown-source}]: [54854,2]

I am also facing same while exporting reports
unable to export report (com.fasterxml.aalto.WFCException: Illegal charecter (null,Unicode 0) encountered: Not valid in any content at[row,col{unknown source}]: [58362,2])

This message is telling you that you tried to process a file that contains a byte 0x00 at the line#58362,column#2. It seems that Katalon Studio has some bug.

You should try to identify which file was problematic. You can enclose your code with a try { ... } catch (Exception x) { .... }. You should be able to print the file path somehow. Once you identified the file path, then look at it at the line#58362,column#2. You may find something informative to debug.