diff --git a/src/Models/ThemeConfig/TagRenderingConfig.ts b/src/Models/ThemeConfig/TagRenderingConfig.ts
index d83939e7d9..7875b9ec9a 100644
--- a/src/Models/ThemeConfig/TagRenderingConfig.ts
+++ b/src/Models/ThemeConfig/TagRenderingConfig.ts
@@ -973,12 +973,11 @@ export class TagRenderingConfigUtils {
             }
             const clone: TagRenderingConfig = Object.create(config)
             // The original mappings get "priorityIf" set
-            const oldMappingsCloned =
-                clone.mappings?.map((m) => ({
-                    ...m,
-                    addExtraTags: "nobrand=",
-                    priorityIf: m.priorityIf ?? TagUtils.Tag("id~*"),
-                })) ?? []
+            const oldMappingsCloned = clone.mappings?.map((m) => (<Mapping> {
+                ...m,
+                addExtraTags: [new Tag("nobrand","")],
+                priorityIf: m.priorityIf ?? TagUtils.Tag("id~*"),
+            })) ?? [];
             clone.mappings = [...oldMappingsCloned, ...extraMappings]
             return clone
         })