Unhandled exception (#860fe2b2) #2824

sqlmap version: 1.1.12.7#dev
Python version: 2.7.14
Operating system: nt
Command line: sqlmap.py -r C:\Users\*************\Desktop\ok119s.head --level 5 --risk 3 --threads=5 -D **** -T user --dump --eta --ignore-timeouts
Technique: BOOLEAN
Back-end DBMS: MySQL (fingerprinted)

Traceback (most recent call last):
  File "sqlmap.py", line 157, in main
    start()
  File "lib/controller/controller.py", line 649, in start
    action()
  File "lib/controller/action.py", line 121, in action
    conf.dbmsHandler.dumpTable()
  File "plugins/generic/entries.py", line 393, in dumpTable
    value = NULL if column in emptyColumns else inject.getValue(query, union=False, error=False, dump=True)
  File "lib/request/inject.py", line 434, in getValue
    value = _goInferenceProxy(query, fromUser, batch, unpack, charsetType, firstChar, lastChar, dump)
  File "lib/request/inject.py", line 287, in _goInferenceProxy
    outputs = _goInferenceFields(expression, expressionFields, expressionFieldsList, payload, charsetType=charsetType, firstChar=firstChar, lastChar=lastChar, dump=dump)
  File "lib/request/inject.py", line 130, in _goInferenceFields
    output = _goInference(payload, expressionReplaced, charsetType, firstChar, lastChar, dump, field)
  File "lib/request/inject.py", line 102, in _goInference
    count, value = bisection(payload, expression, length, charsetType, firstChar, lastChar, dump)
  File "lib/techniques/blind/inference.py", line 628, in bisection
    progress.progress(time.time() - charStart, index)
NameError: global name 'charStart' is not defined