2 files changed, 11 insertions, 6 deletions
diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index 973b7749..64d462ae 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -108,7 +108,7 @@ class Display {
 
         if (context) {
             for (const definition of definitions) {
-                definition.cloze = clozeBuild(context.sentence, definition.source);
+                definition.cloze = clozeBuild(context.sentence);
                 definition.url = context.url;
             }
         }
diff --git a/ext/mixed/js/util.js b/ext/mixed/js/util.js
index eae54f49..62838674 100644
--- a/ext/mixed/js/util.js
+++ b/ext/mixed/js/util.js
@@ -22,12 +22,17 @@
  */
 
 function clozeBuild(sentence, source) {
-    return {
-        sentence: sentence.text.trim(),
-        prefix: sentence.text.substring(0, sentence.offset).trim(),
-        body: source.trim(),
-        suffix: sentence.text.substring(sentence.offset + source.length).trim()
+    const result = {
+        sentence: sentence.text.trim()
     };
+
+    if (source) {
+        result.prefix = sentence.text.substring(0, sentence.offset).trim();
+        result.body = source.trim();
+        result.suffix = sentence.text.substring(sentence.offset + source.length).trim();
+    }
+
+    return result;
 }