diff --git a/frontend/src/ts/popups/skeleton.ts b/frontend/src/ts/popups/skeleton.ts
index a74e4a946..ee6e637d0 100644
--- a/frontend/src/ts/popups/skeleton.ts
+++ b/frontend/src/ts/popups/skeleton.ts
@@ -3,6 +3,7 @@ const skeletons = new Map<string, HTMLElement>();
 
 export function save(id: string, removeAfter = true): void {
   const el = document.getElementById(id) as HTMLElement;
+  if (!el) throw new Error(`Element with id ${id} not found`);
   skeletons.set(id, el);
   if (removeAfter) remove(id);
 }