Hi,
because of changes made in the encoding method of lz-string(pieroxy/lz-string@2d5a419), the javascript version can produce strings that can't be decompressed with this version.
This example raise an IndexError:
l=lzstring.LZString()
l.decompresFromBase64("A4cwdA9gtAcg9APyA===")
If anyone is interested I've found this https://github.com/pieroxy/lz-string/blob/0dda98caa06c4c09e251a96378538169dfbc5a5f/libs/lz-string.js as the last version compatible.