diff --git a/app/src/layout/dock/Backlink.ts b/app/src/layout/dock/Backlink.ts
index 4489d5679..d4acd55ce 100644
--- a/app/src/layout/dock/Backlink.ts
+++ b/app/src/layout/dock/Backlink.ts
@@ -410,8 +410,8 @@ export class Backlink extends Model {
     }
 
     private toggleItem(liElement: HTMLElement, isMention: boolean) {
-        const svgElement = liElement.firstElementChild.firstElementChild;
-        if (svgElement.getAttribute("disabled")) {
+        const svgElement = liElement.firstElementChild?.firstElementChild;
+        if (!svgElement || svgElement.getAttribute("disabled")) {
             return;
         }
         svgElement.setAttribute("disabled", "disabled");