diff --git a/theme/src/client/components/background/TintPlate.vue b/theme/src/client/components/background/TintPlate.vue
index 589a1e9e..dcad91b5 100644
--- a/theme/src/client/components/background/TintPlate.vue
+++ b/theme/src/client/components/background/TintPlate.vue
@@ -17,9 +17,9 @@ const config = computed(() => {
     return rgb
   }
   if (light || dark) {
-    return { light, dark }
+    return cleanObject({ light, dark })
   }
-  return { r, g, b }
+  return cleanObject({ r, g, b })
 })
 
 const lightTint = {
@@ -34,6 +34,14 @@ const darkTint = {
   b: { value: 32, offset: 36 },
 }
 
+function cleanObject(obj: any) {
+  for (const key in obj) {
+    if (obj[key] === undefined)
+      delete obj[key]
+  }
+  return obj
+}
+
 function toPlate(plate: number | string) {
   return typeof plate === 'number' || Number(plate) === Number.parseInt(plate)
     ? [plate, plate, plate].map(n => Number(n))