pypdf decode error

Traceback (most recent call last):
  File "./test.py", line 12, in <module>
    outputPdf.write(outpdf)
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 264, in write
    self._sweepIndirectReferences(externalReferenceMap, self._root)
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 339, in _sweepIndirectReferences
    self._sweepIndirectReferences(externMap, realdata)
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 315, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 339, in _sweepIndirectReferences
    self._sweepIndirectReferences(externMap, realdata)
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 315, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 324, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, data[i])
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 339, in _sweepIndirectReferences
    self._sweepIndirectReferences(externMap, realdata)
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 315, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 315, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 315, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 345, in _sweepIndirectReferences
    newobj = data.pdf.getObject(data)
  File "/usr/lib/python2.7/site-packages/pyPdf/pdf.py", line 649, in getObject
    retval = readObject(self.stream, self)
  File "/usr/lib/python2.7/site-packages/pyPdf/generic.py", line 58, in readObject
    return ArrayObject.readFromStream(stream, pdf)
  File "/usr/lib/python2.7/site-packages/pyPdf/generic.py", line 153, in readFromStream
    arr.append(readObject(stream, pdf))
  File "/usr/lib/python2.7/site-packages/pyPdf/generic.py", line 52, in readObject
    return readStringFromStream(stream)
  File "/usr/lib/python2.7/site-packages/pyPdf/generic.py", line 341, in readStringFromStream
    return createStringObject(txt)
  File "/usr/lib/python2.7/site-packages/pyPdf/generic.py", line 248, in createStringObject
    retval = TextStringObject(string.decode("utf-16"))
  File "/usr/lib64/python2.7/encodings/utf_16.py", line 16, in decode
    return codecs.utf_16_decode(input, errors, True)
UnicodeDecodeError: 'utf16' codec can't decode bytes in position 74-75: illegal UTF-16 surrogate