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The only way (in Dec. 2019) to get espeak_ListVoices to actually list all the voices, including variants and mbrola voices used to be to pass a non-null voice selector with a null language pointer. This still seems to be supported in SetVoiceScores, which still checks for a null language (see the check right at the top), however new code has been added for a pseudo voice "all" lower down which seems to do the same thing but crashes with null. This change allows "old" code to continue working. Signed-off-by: John Bowler <jbowler@acm.org>