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-rw-r--r--src/lib/writer.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/lib/writer.cc b/src/lib/writer.cc
index d6c3370b0..d86a2ccf4 100644
--- a/src/lib/writer.cc
+++ b/src/lib/writer.cc
@@ -664,6 +664,8 @@ Writer::write (PlayerSubtitles subs, DCPTimePeriod period)
++_subtitle_reel;
}
+ DCPOMATIC_ASSERT (_subtitle_reel != _reels.end());
+
_subtitle_reel->write (subs);
}