You said：“Usually this is not fatal”，but it seems that something is wrong...

C:\Users\Helloworld\Desktop\pdf>ipython
Python 3.6.2 (v3.6.2:5fd33b5, Jul  8 2017, 04:57:36) [MSC v.1900 64 bit (AMD64)]
Type 'copyright', 'credits' or 'license' for more information
IPython 6.2.1 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import PyPDF2

In [2]: pdf_fileobj = open("afile.pdf", "rb")

In [3]: pdf_reader = PyPDF2.PdfFileReader(pdf_fileobj)
PdfReadWarning: Xref table not zero-indexed. ID numbers for objects will be corrected. [pdf.py:1736]

In [4]: pdf_reader.numPages
---------------------------------------------------------------------------
PdfReadError                              Traceback (most recent call last)
<ipython-input-4-29a8f66e8824> in <module>()
----> 1 pdf_reader.numPages

c:\program files\python36\lib\site-packages\PyPDF2\pdf.py in <lambda>(self)
   1156             return len(self.flattenedPages)
   1157
-> 1158     numPages = property(lambda self: self.getNumPages(), None, None)
   1159     """
   1160     Read-only property that accesses the

c:\program files\python36\lib\site-packages\PyPDF2\pdf.py in getNumPages(self)
   1153         else:
   1154             if self.flattenedPages == None:
-> 1155                 self._flatten()
   1156             return len(self.flattenedPages)
   1157

c:\program files\python36\lib\site-packages\PyPDF2\pdf.py in _flatten(self, pages, inherit, indirectRef)
   1503         if pages == None:
   1504             self.flattenedPages = []
-> 1505             catalog = self.trailer["/Root"].getObject()
   1506             pages = catalog["/Pages"].getObject()
   1507

c:\program files\python36\lib\site-packages\PyPDF2\generic.py in __getitem__(self, key)
    514
    515     def __getitem__(self, key):
--> 516         return dict.__getitem__(self, key).getObject()
    517
    518     ##

c:\program files\python36\lib\site-packages\PyPDF2\generic.py in getObject(self)
    176
    177     def getObject(self):
--> 178         return self.pdf.getObject(self).getObject()
    179
    180     def __repr__(self):

c:\program files\python36\lib\site-packages\PyPDF2\pdf.py in getObject(self, indirectReference)
   1602                 if self.strict:
   1603                     raise utils.PdfReadError("Expected object ID (%d %d) does not match actual (%d %d); xref table not zero-indexed." \
-> 1604                                      % (indirectReference.idnum, indirectReference.generation, idnum, generation))
   1605                 else: pass # xref table is corrected in non-strict mode
   1606             elif idnum != indirectReference.idnum:

PdfReadError: Expected object ID (8 0) does not match actual (7 0); xref table not zero-indexed.

In [5]: pdf_reader.getNumPages()
Out[5]: 0

Actually, "afile.pdf" has 2 pages.
I don't know why raise PdfReadError?

afile.pdf

PyPDF2 warning in PyPDF2 1.19 #36

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