diff --git a/src/public/app/components/app_context.ts b/src/public/app/components/app_context.ts
index 16d2d5920..e4e94d1a7 100644
--- a/src/public/app/components/app_context.ts
+++ b/src/public/app/components/app_context.ts
@@ -75,6 +75,7 @@ export type CommandMappings = {
         searchString?: string;
         ancestorNoteId?: string | null;
     };
+    showLaunchBarSubtree: CommandData;
     showOptions: CommandData & {
         section: string;
     };
diff --git a/src/public/app/widgets/spacer.js b/src/public/app/widgets/spacer.ts
similarity index 86%
rename from src/public/app/widgets/spacer.js
rename to src/public/app/widgets/spacer.ts
index 396cec598..2c3c9662b 100644
--- a/src/public/app/widgets/spacer.js
+++ b/src/public/app/widgets/spacer.ts
@@ -6,6 +6,10 @@ import appContext from "../components/app_context.js";
 const TPL = `<div class="spacer"></div>`;
 
 export default class SpacerWidget extends BasicWidget {
+
+    private baseSize: number;
+    private growthFactor: number;
+
     constructor(baseSize = 0, growthFactor = 1000) {
         super();
 
@@ -29,7 +33,9 @@ export default class SpacerWidget extends BasicWidget {
                     {title: t("spacer.configure_launchbar"), command: "showLaunchBarSubtree", uiIcon: "bx bx-sidebar"}
                 ],
                 selectMenuItemHandler: ({command}) => {
-                    appContext.triggerCommand(command);
+                    if (command) {
+                        appContext.triggerCommand(command);
+                    }
                 }
             });