diff --git a/ui_template/sheet/ui_template_sheet_render.ts b/ui_template/sheet/ui_template_sheet_render.ts
index 2ef7da45..72737824 100644
--- a/ui_template/sheet/ui_template_sheet_render.ts
+++ b/ui_template/sheet/ui_template_sheet_render.ts
@@ -240,7 +240,11 @@ export function renderSheet(state: RenderState): HTMLElement {
       cols.forEach((col, j) => {
         const td = bodyCell(`t:${total.id}`, col, j, shown(state.result.합계[total.id]?.[col.id]));
         const formula = totalFormula(total, col);
-        if (formula) td.title = formulaLabel(formula, names);
+        if (formula)
+          td.title = td.classList.contains("is-error")
+            ? `${td.title}
+${formulaLabel(formula, names)}`
+            : formulaLabel(formula, names);
         tr.append(td);
       });
       return tr;