diff --git a/js/scorm/wrapper.js b/js/scorm/wrapper.js
index e03c705..8d613af 100644
--- a/js/scorm/wrapper.js
+++ b/js/scorm/wrapper.js
@@ -569,7 +569,7 @@ class ScormWrapper {
       if (error.data.value === '') error.data.value = '\'\'';
     }
     const config = Adapt.course.get('_spoor');
-    const messages = Object.assign({}, ScormError.defaultMessages, config && config._messages);
+    const messages = Object.assign({}, ScormError.defaultMessages, config?._messages || {});
     const message = Handlebars.compile(messages[error.name])(error.data);
     this.logger.error(message);
     if (this.isUnsupportedErrorCode(error.data.errorCode)) return;