diff --git a/src/panels/config/voice-assistants/assist-pipeline-detail/assist-pipeline-detail-config.ts b/src/panels/config/voice-assistants/assist-pipeline-detail/assist-pipeline-detail-config.ts
index 19d78a6527..856af04c39 100644
--- a/src/panels/config/voice-assistants/assist-pipeline-detail/assist-pipeline-detail-config.ts
+++ b/src/panels/config/voice-assistants/assist-pipeline-detail/assist-pipeline-detail-config.ts
@@ -1,9 +1,10 @@
 import { css, CSSResultGroup, html, LitElement } from "lit";
 import { customElement, property } from "lit/decorators";
 import memoizeOne from "memoize-one";
-import { SchemaUnion } from "../../../../components/ha-form/types";
+import { LocalizeKeys } from "../../../../common/translations/localize";
 import { AssistPipeline } from "../../../../data/assist_pipeline";
 import { HomeAssistant } from "../../../../types";
+import "../../../../components/ha-form/ha-form";
 
 @customElement("assist-pipeline-detail-config")
 export class AssistPipelineDetailConfig extends LitElement {
@@ -33,26 +34,28 @@ export class AssistPipelineDetailConfig extends LitElement {
                 text: {},
               },
             },
-            {
-              name: "language",
-              required: true,
-              selector: {
-                language: {
-                  languages: supportedLanguages ?? [],
-                },
-              },
-            },
+            supportedLanguages
+              ? {
+                  name: "language",
+                  required: true,
+                  selector: {
+                    language: {
+                      languages: supportedLanguages,
+                    },
+                  },
+                }
+              : { name: "", type: "constant" },
           ] as const,
         },
       ] as const
   );
 
-  private _computeLabel = (
-    schema: SchemaUnion<ReturnType<typeof this._schema>>
-  ): string =>
-    this.hass.localize(
-      `ui.panel.config.voice_assistants.assistants.pipeline.detail.form.${schema.name}`
-    );
+  private _computeLabel = (schema): string =>
+    schema.name
+      ? this.hass.localize(
+          `ui.panel.config.voice_assistants.assistants.pipeline.detail.form.${schema.name}` as LocalizeKeys
+        )
+      : "";
 
   protected render() {
     return html`
diff --git a/src/panels/config/voice-assistants/dialog-voice-assistant-pipeline-detail.ts b/src/panels/config/voice-assistants/dialog-voice-assistant-pipeline-detail.ts
index aa221e8b66..6048cfc0ac 100644
--- a/src/panels/config/voice-assistants/dialog-voice-assistant-pipeline-detail.ts
+++ b/src/panels/config/voice-assistants/dialog-voice-assistant-pipeline-detail.ts
@@ -44,7 +44,7 @@ export class DialogVoiceAssistantPipelineDetail extends LitElement {
 
   @state() private _submitting = false;
 
-  @state() private _supportedLanguages: string[] = [];
+  @state() private _supportedLanguages?: string[];
 
   public showDialog(params: VoiceAssistantPipelineDetailsDialogParams): void {
     this._params = params;