[sqlite] syntax error on SELECT with WHERE EXISTS

[James Walker]

Why do I get a syntax error from this SQL?

SELECT * FROM SnappedFrames WHERE EXISTS (SELECT 1 FROM FilmSizeOverrides);

SQLite says the error is near SELECT, but doesn't say which SELECT.  If 
I say either

SELECT * FROM SnappedFrames WHERE 1;

or

SELECT 1 FROM FilmSizeOverrides;

then there's no error.