diff --git a/src/components/dashboard/dashboard-hero.tsx b/src/components/dashboard/dashboard-hero.tsx
index 2641aa5..4f8d008 100644
--- a/src/components/dashboard/dashboard-hero.tsx
+++ b/src/components/dashboard/dashboard-hero.tsx
@@ -407,7 +407,7 @@ function QueueSparklineCard({
                 <ChartTooltipContent
                   labelFormatter={(value) => formatDateDMY(new Date(value as string))}
                   valueFormatter={(value) =>
-                    typeof value === "number" ? value.toLocaleString("pt-BR") : value
+                    typeof value === "number" ? value.toLocaleString("pt-BR") : String(value ?? "")
                   }
                 />
               }