Import on Filename changes mid import due to book error

[Vortex]

I'm getting an error when trying to import a big collection of ebooks, mostly old formats with filenames all in the same naming format, so I'm importing them on filename not metadata. I've tried 4 times now and every time about half way through the import changes and messes up the import so the whole filename is the Title field. I get an error message at the end of the import. I've had 3 different books give the error so far, all pdf's, if I import the books on their own they import fine with no error. When I look thorough the imported books every book after the one giving the error is imported wrongly so the whole filename is the Title field from then on.

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Failed to read metadata from the file(s):
E:/EBOOKS/C/Elizabeth Chater - The Runaway Debutante.pdf
With error:
Traceback (most recent call last):
File "site-packages\calibre\utils\ipc\pool.py", line 363, in worker_main
File "site-packages\calibre\ebooks\metadata\worker.py", line 59, in read_metadata
File "site-packages\calibre\ebooks\metadata\worker.py", line 39, in run_import_plugins
File "site-packages\calibre\customize\ui.py", line 159, in _run_filetype_plugins
File "traceback.py", line 233, in print_exc
File "traceback.py", line 124, in print_exception
File "traceback.py", line 13, in _print
File "calibre_plugins.dedrm.__init__", line 77, in write
File "calibre_plugins.dedrm.__init__", line 79, in __getattr__
File "calibre_plugins.dedrm.__init__", line 79, in __getattr__

The last line repeats for hundreds of lines.

[kovidgoyal]

Disable the DRM removal plugin and you should be fine.

[Vortex]

Thanks Kovid. Is it a bug in a recent Calibre update or the DeDRM plugin? I've never had it happen before, then 4 times in a row. The DeDRM plugin is kind of useful.

[kovidgoyal]

It is a bug in the DeDRM plugin, that was exposed by a recent calibre change. I imagine its authors will fix it soon enough. And I have committed some code that prevents bugs in plugins from preventing successful reading of file metadata.