diff --git a/ext/mixed/js/api.js b/ext/mixed/js/api.js
index 715c8286..86bdc73c 100644
--- a/ext/mixed/js/api.js
+++ b/ext/mixed/js/api.js
@@ -58,7 +58,7 @@ function apiDefinitionAdd(definition, mode, context, optionsContext) {
 }
 
 function apiDefinitionsAddable(definitions, modes, optionsContext) {
-    return _apiInvoke('definitionsAddable', {definitions, modes, optionsContext}).catch(() => null);
+    return _apiInvoke('definitionsAddable', {definitions, modes, optionsContext});
 }
 
 function apiNoteView(noteId) {
diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index 045ce906..5c010747 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -414,7 +414,7 @@ class Display {
 
         this.setEventListenersActive(true);
 
-        const states = await apiDefinitionsAddable(definitions, ['term-kanji', 'term-kana'], this.getOptionsContext());
+        const states = await this.getDefinitionsAddable(definitions, ['term-kanji', 'term-kana']);
         if (this.setContentToken !== token) { return; }
 
         this.updateAdderButtons(states);
@@ -463,7 +463,7 @@ class Display {
 
         this.setEventListenersActive(true);
 
-        const states = await apiDefinitionsAddable(definitions, ['kanji'], this.getOptionsContext());
+        const states = await this.getDefinitionsAddable(definitions, ['kanji']);
         if (this.setContentToken !== token) { return; }
 
         this.updateAdderButtons(states);
@@ -776,6 +776,14 @@ class Display {
         return entry !== null ? entry.querySelector('.action-play-audio>img') : null;
     }
 
+    async getDefinitionsAddable(definitions, modes) {
+        try {
+            return await apiDefinitionsAddable(definitions, modes, this.getOptionsContext());
+        } catch (e) {
+            return [];
+        }
+    }
+
     static delay(time) {
         return new Promise((resolve) => setTimeout(resolve, time));
     }