diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a3c091..41b5625 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@ This change log follows the conventions of
   often](https://github.com/Deep-Symmetry/beat-link-trigger/issues/185).
   Thanks to [Deniz Gencer, @Firedude1](https://github.com/Firedude1)
   who noticed it was thrashing his GPU and reported this.
+- An error in the helper code for user expressions caused an exception when attempting to use the `track-length` convenience variable with real (but not simulated) events.
 
 ## [7.4.1] - 2024-06-01
 
diff --git a/src/beat_link_trigger/expressions.clj b/src/beat_link_trigger/expressions.clj
index d3ee233..cea56d5 100644
--- a/src/beat_link_trigger/expressions.clj
+++ b/src/beat_link_trigger/expressions.clj
@@ -358,7 +358,7 @@
                                           :doc  "The label of the loaded track, if metadata is available."}
                          'track-length   {:code '(if-let [data util/*simulating*]
                                                    (get-in data [:metadata :duration])
-                                                   (when (some? track-metadata) (.getLength track-metadata)))
+                                                   (when (some? track-metadata) (.getDuration track-metadata)))
                                           :doc  "The length in seconds of the loaded track, if metadata is available."}
                          'track-metadata {:code '(when-not util/*simulating*
                                                    (.getLatestMetadataFor