Error in Line 499

[fmontebaur]

I get the this error:

{
"data":[Traceback (most recent call last):
File "citrix.xenserver.py", line 499, in
main(sys.argv[1:])
File "citrix.xenserver.py", line 491, in main
if ( command == 'list' ): printoutKeysByRegex(filename,host,filter)
File "citrix.xenserver.py", line 327, in printoutKeysByRegex
sys.stdout.write (outstring)
UnboundLocalError: local variable 'outstring' referenced before assignment

Zabbix Version: 5.0.4
Phyton Version is 3.7
OS: Debian 10.6