diff --git a/VERSION.md b/VERSION.md
index 7ea9d8f..dc36cac 100644
--- a/VERSION.md
+++ b/VERSION.md
@@ -1,5 +1,9 @@
 # Version history
 
+## Unreleased
+
+* Internal errors in Rhubarb Lip Sync for Spine are logged to stderr
+
 ## Version 1.7.0
 
 * Integration with Spine animation software
diff --git a/extras/EsotericSoftwareSpine/src/main/kotlin/com/rhubarb_lip_sync/rhubarb_for_spine/AudioFileModel.kt b/extras/EsotericSoftwareSpine/src/main/kotlin/com/rhubarb_lip_sync/rhubarb_for_spine/AudioFileModel.kt
index 497acc6..0a30f6a 100644
--- a/extras/EsotericSoftwareSpine/src/main/kotlin/com/rhubarb_lip_sync/rhubarb_for_spine/AudioFileModel.kt
+++ b/extras/EsotericSoftwareSpine/src/main/kotlin/com/rhubarb_lip_sync/rhubarb_for_spine/AudioFileModel.kt
@@ -162,6 +162,8 @@ class AudioFileModel(
 				}
 			} catch (e: InterruptedException) {
 			} catch (e: Exception) {
+				e.printStackTrace(System.err);
+
 				Platform.runLater {
 					Alert(Alert.AlertType.ERROR).apply {
 						headerText = "Error performing lip sync for event '$eventName'."