i have a error in pysnmp:caused by <class 'IndexError'>: pop from empty list

Question

i have a error in pysnmp:caused by <class 'IndexError'>: pop from empty list

I am confused. I didn't do anything，But sometimes my code doesn't work

but sometimes

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "../conpot/protocols/snmp/conpot_cmdrsp.py", line 170, in handleMgmtOperation
rspVarBinds = self.proxy.getRequest(snmp_version, oid, **user_info)
File "../conpot/protocols/snmp/snmp_proxy.py", line 65, in getRequest
ObjectIdentity(*args)
File "/usr/local/lib/python3.6/site-packages/pysnmp/entity/rfc3413/oneliner/cmdgen.py", line 183, in getCmd
**kwargs):
File "/usr/local/lib/python3.6/site-packages/pysnmp/hlapi/asyncore/sync/cmdgen.py", line 113, in getCmd
snmpEngine.transportDispatcher.runDispatcher()
File "/usr/local/lib/python3.6/site-packages/pysnmp/carrier/asyncore/dispatch.py", line 50, in runDispatcher
raise PySnmpError('poll error: %s' % ';'.join(format_exception(*exc_info())))
pysnmp.error.PySnmpError: poll error: Traceback (most recent call last):
; File "/usr/local/lib/python3.6/site-packages/pysnmp/carrier/asyncore/dispatch.py", line 46, in runDispatcher
use_poll=True, map=self.__sockMap, count=1)
; File "/usr/lib64/python3.6/asyncore.py", line 207, in loop
poll_fun(timeout, map)
; File "/usr/lib64/python3.6/asyncore.py", line 188, in poll2
readwrite(obj, flags)
; File "/usr/lib64/python3.6/asyncore.py", line 123, in readwrite
obj.handle_error()
; File "/usr/lib64/python3.6/asyncore.py", line 110, in readwrite
obj.handle_write_event()
; File "/usr/lib64/python3.6/asyncore.py", line 442, in handle_write_event
self.handle_write()
; File "/usr/local/lib/python3.6/site-packages/pysnmp/carrier/asyncore/dgram/base.py", line 142, in handle_write
outgoingMessage, transportAddress = self.__outQueue.pop()
;IndexError: pop from empty list
caused by <class 'IndexError'>: pop from empty list