Empty CMAP subtables in 2.5b

When I dump a font generated with Glyphs 2.5b (1066), there are some error messages about empty CMAP subtables:

ERROR: cmap subtable is reported as having zero length: platformID 0, platEncID 4, format 0 offset 3408. Skipping table.
ERROR: cmap subtable is reported as having zero length: platformID 3, platEncID 10, format 0 offset 3408. Skipping table.
Dumping 'cmap' table...

Can you send me the original .glyphs file?

The error appears as soon as there’s a glyph with Unicode > 0xFFFF in the font.

Fixed it. And an update is already up.

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The bug seems to be back in build 1071 …