Running version: 1.4.11#stable
Python version: 3.8.2
Operating system: Windows-2012ServerR2-6.3.9600-SP0
Command line: sqlmap.py -r ***** -p productid --hpp -v 3 --dbms mysql --tamper=space2hash.py,charunicodeencode.py,space2mysqldash.py,percentage.py --hex --sql-shell
Technique: TIME
Back-end DBMS: MySQL (fingerprinted)

Traceback (most recent call last):
  File "sqlmap.py", line 215, in main
    start()
  File "lib/core/decorators.py", line 78, in _
    result = f(*args, **kwargs)
  File "lib/controller/controller.py", line 704, in start
    action()
  File "lib/controller/action.py", line 192, in action
    conf.dbmsHandler.sqlShell()
  File "plugins/generic/custom.py", line 114, in sqlShell
    output = self.sqlQuery(query)
  File "plugins/generic/custom.py", line 59, in sqlQuery
    output = inject.getValue(query, fromUser=True)
  File "lib/core/decorators.py", line 94, in _
    result = f(*args, **kwargs)
  File "lib/core/decorators.py", line 78, in _
    result = f(*args, **kwargs)
  File "lib/request/inject.py", line 484, in getValue
    value = _goInferenceProxy(query, fromUser, batch, unpack, charsetType, firstChar, lastChar, dump)
  File "lib/request/inject.py", line 289, in _goInferenceProxy
    for num in xrange(startLimit, stopLimit):
TypeError: 'NoneType' object cannot be interpreted as an integer