<ContentVersion> is optional in Interop so we can't assume it's there.

[libdcp.git] / src / cpl.cc

diff --git a/src/cpl.cc b/src/cpl.cc
index ead592fd4e1e2abcc10879d75edc07081e2dcfa0..2768e797583b295b9b00ac93f15ab8d0378df55a 100644 (file)
--- a/src/cpl.cc
+++ b/src/cpl.cc
@@ -654,10 +654,13 @@ CPL::set_content_versions (vector<ContentVersion> v)
 }
 
 
-ContentVersion
+optional<ContentVersion>
 CPL::content_version () const
 {
-       DCP_ASSERT (!_content_versions.empty());
+       if (_content_versions.empty()) {
+               return optional<ContentVersion>();
+       }
+
        return _content_versions[0];
 }