diff --git a/src/panels/config/script/ha-script-field-row.ts b/src/panels/config/script/ha-script-field-row.ts
index bb5c8db07e34..1d0a810eaeb2 100644
--- a/src/panels/config/script/ha-script-field-row.ts
+++ b/src/panels/config/script/ha-script-field-row.ts
@@ -2,7 +2,7 @@ import { ActionDetail } from "@material/mwc-list/mwc-list-foundation";
 import "@material/mwc-list/mwc-list-item";
 import { mdiDelete, mdiDotsVertical } from "@mdi/js";
 import { CSSResultGroup, LitElement, css, html } from "lit";
-import { customElement, property } from "lit/decorators";
+import { customElement, property, state } from "lit/decorators";
 import { classMap } from "lit/directives/class-map";
 import memoizeOne from "memoize-one";
 import { fireEvent } from "../../../common/dom/fire_event";
@@ -32,6 +32,10 @@ export default class HaScriptFieldRow extends LitElement {
 
   @property({ type: Boolean }) public disabled = false;
 
+  @state() private _error?: Record<string, string>;
+
+  private _errorKey?: string;
+
   private _schema = memoizeOne(
     (selector: any) =>
       [
@@ -73,7 +77,7 @@ export default class HaScriptFieldRow extends LitElement {
 
     const schema = this._schema(selector);
 
-    const data = { ...this.field, key: this.key };
+    const data = { ...this.field, key: this._errorKey ?? this.key };
 
     return html`
       <ha-card outlined>
@@ -115,9 +119,11 @@ export default class HaScriptFieldRow extends LitElement {
             <ha-form
               .schema=${schema}
               .data=${data}
+              .error=${this._error}
               .hass=${this.hass}
               .disabled=${this.disabled}
               .computeLabel=${this._computeLabelCallback}
+              .computeError=${this._computeError}
               @value-changed=${this._valueChanged}
             ></ha-form>
           </div>
@@ -157,8 +163,18 @@ export default class HaScriptFieldRow extends LitElement {
 
     // Don't allow to set an empty key, or duplicate an existing key.
     if (!value.key || this.excludeKeys.includes(value.key)) {
+      this._error = value.key
+        ? {
+            key: "key_not_unique",
+          }
+        : {
+            key: "key_not_null",
+          };
+      this._errorKey = value.key ?? "";
       return;
     }
+    this._errorKey = undefined;
+    this._error = undefined;
 
     // If we render the default with an incompatible selector, it risks throwing an exception and not rendering.
     // Clear the default when changing the selector.
@@ -186,6 +202,10 @@ export default class HaScriptFieldRow extends LitElement {
     }
   };
 
+  private _computeError = (error: string) =>
+    this.hass.localize(`ui.panel.config.script.editor.field.${error}` as any) ||
+    error;
+
   static get styles(): CSSResultGroup {
     return [
       haStyle,
diff --git a/src/translations/en.json b/src/translations/en.json
index c421721e91db..4072f2a42bac 100644
--- a/src/translations/en.json
+++ b/src/translations/en.json
@@ -2989,7 +2989,9 @@
               "required": "Required",
               "example": "Example",
               "default": "Default",
-              "selector": "Selector"
+              "selector": "Selector",
+              "key_not_null": "The field key must not be empty.",
+              "key_not_unique": "The field key must not be the same value as another field."
             },
             "add_field": "Add field",
             "field_delete_confirm_title": "Delete field?",