sqlmap version: 1.0-dev-dc7f2a7
Python version: 2.7.3
Operating system: posix
Command line: sqlmap.py -d ********************************* --os-shell --dbms=mysql
Technique: DIRECT
Back-end DBMS: MySQL (fingerprinted)

Traceback (most recent call last):
  File "sqlmap.py", line 110, in main
    start()
  File "lib/controller/controller.py", line 258, in start
    action()
  File "lib/controller/action.py", line 160, in action
    conf.dbmsHandler.osShell()
  File "plugins/generic/takeover.py", line 80, in osShell
    self.initEnv(web=web)
  File "lib/takeover/abstraction.py", line 204, in initEnv
    success = self.udfInjectSys()
  File "lib/takeover/udf.py", line 186, in udfInjectSys
    return self.udfInjectCore(self.sysUdfs)
  File "lib/takeover/udf.py", line 149, in udfInjectCore
    self.udfSetRemotePath()
  File "plugins/dbms/mysql/takeover.py", line 63, in udfSetRemotePath
    self.__plugindir = ntToPosixSlashes(normalizePath(self.__plugindir))
  File "lib/core/common.py", line 1752, in ntToPosixSlashes
    return filepath.replace('\\', '/')
AttributeError: 'NoneType' object has no attribute 'replace'