book editor error when adding 100 items

[craig warhurst]

After adding a stylesheet, 48 html pages and 48 images, trying to add another page or image gives the following error message:

calibre, version 1.24.0
ERROR: Unhandled exception: <b>IndexError</b>:The checkpoint stack has an incorrect position pointer. This should never happen: self.pos = 100, len(self.states) = 100

calibre 1.24 [64bit] isfrozen: True is64bit: True
Windows-7-6.1.7601-SP1 Windows ('64bit', 'WindowsPE')
('Windows', '7', '6.1.7601')
Python 2.7.5
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Traceback (most recent call last):
  File "site-packages\calibre\gui2\tweak_book\boss.py", line 304, in add_file
  File "site-packages\calibre\gui2\tweak_book\boss.py", line 503, in add_savepoint
  File "site-packages\calibre\gui2\tweak_book\undo.py", line 99, in add_savepoint
IndexError: The checkpoint stack has an incorrect position pointer. This should never happen: self.pos = 100, len(self.states) = 100

I agree it should never happen. But it does :-)

Workaround: if you save the book and exit the program, then open and reload it you can then continue adding more items.

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every Friday.

 status fixreleased