This happens when "string" is a blank string. It's actually a bug in the
function that we've come across elsewhere, but I think we did something else to
fix it and didn't fix the function itself.
You should be able to fix that by changing line 532 in
openlp/core/utils/__init__.py to this:
if string and string[0].isdigit():
--
https://code.launchpad.net/~minkus/openlp/naturalsortsongs/+merge/289566
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