diff --git a/src/ffi.cpp b/src/ffi.cpp
index d76fd3d..7ea3e4e 100644
--- a/src/ffi.cpp
+++ b/src/ffi.cpp
@@ -725,6 +725,8 @@ extern "C" {
                 signalUnknownError(outError);
             }
         #endif
+
+        return NULL;
     }
 
     // --- CXmpDateTime ---