diff --git a/src/components/ha-selector/ha-selector-select.ts b/src/components/ha-selector/ha-selector-select.ts
index 82ebf8bc1fe0..b32c02c6fd31 100644
--- a/src/components/ha-selector/ha-selector-select.ts
+++ b/src/components/ha-selector/ha-selector-select.ts
@@ -383,8 +383,13 @@ export class HaSelectSelector extends LitElement {
       return label.toLowerCase().includes(this._filter?.toLowerCase());
     });
 
-    if (this._filter && this.selector.select?.custom_value) {
-      filteredItems?.unshift({ label: this._filter, value: this._filter });
+    if (
+      this._filter &&
+      this.selector.select?.custom_value &&
+      filteredItems &&
+      !filteredItems.some((item) => (item.label || item.value) === this._filter)
+    ) {
+      filteredItems.unshift({ label: this._filter, value: this._filter });
     }
 
     this.comboBox.filteredItems = filteredItems;