Add an assert.

diff --git a/src/lib/reel_writer.cc b/src/lib/reel_writer.cc
index 90cd9f26b8408a8ae015a1c8529c5a405384cdfd..edc3b0d7bba617bec0b11fe47a2bd79a7efdf581 100644 (file)
--- a/src/lib/reel_writer.cc
+++ b/src/lib/reel_writer.cc
@@ -185,6 +185,7 @@ ReelWriter::ReelWriter (
                        _mpeg2_picture_asset_writer = _mpeg2_picture_asset->start_write(new_asset_filename, behaviour);
                }
        } else {
+               DCPOMATIC_ASSERT(existing_asset_filename);
                LOG_GENERAL("Re-using complete asset %1", *existing_asset_filename);
                /* We already have a complete picture asset that we can just re-use */
                /* XXX: what about if the encryption key changes? */