diff --git a/apps/client-standalone/src/lightweight/browser_routes.ts b/apps/client-standalone/src/lightweight/browser_routes.ts
index c60d9f7ddd..556eaf9ce7 100644
--- a/apps/client-standalone/src/lightweight/browser_routes.ts
+++ b/apps/client-standalone/src/lightweight/browser_routes.ts
@@ -180,6 +180,10 @@ function createMockExpressResponse() {
             res._headers[name] = value;
             return res;
         },
+        removeHeader(name: string) {
+            delete res._headers[name];
+            return res;
+        },
         status(code: number) {
             res._status = code;
             return res;
diff --git a/apps/client/src/widgets/react/FormRadioGroup.tsx b/apps/client/src/widgets/react/FormRadioGroup.tsx
index 5be724a8ce..54eaa07fe2 100644
--- a/apps/client/src/widgets/react/FormRadioGroup.tsx
+++ b/apps/client/src/widgets/react/FormRadioGroup.tsx
@@ -20,7 +20,7 @@ export default function FormRadioGroup({ values, ...restProps }: FormRadioProps)
                 if (!el) return null;
                 const { value, label, inlineDescription } = el;
                 return (
-                    <div className="form-checkbox">
+                    <div className="form-checkbox" key={value}>
                         <FormRadio
                             value={value}
                             label={label} inlineDescription={inlineDescription}
@@ -40,7 +40,7 @@ export function FormInlineRadioGroup({ values, ...restProps }: FormRadioProps) {
             {values.map((el) => {
                 if (!el) return null;
                 const { value, label, inlineDescription } = el;
-                return <FormRadio value={value} label={label} inlineDescription={inlineDescription} {...restProps} />;
+                return <FormRadio key={value} value={value} label={label} inlineDescription={inlineDescription} {...restProps} />;
             })}
         </div>
     );
diff --git a/packages/trilium-core/src/routes/api/others.ts b/packages/trilium-core/src/routes/api/others.ts
index 59f1570e07..087391ffa0 100644
--- a/packages/trilium-core/src/routes/api/others.ts
+++ b/packages/trilium-core/src/routes/api/others.ts
@@ -4,12 +4,12 @@ import { RenderMarkdownResponse, ToMarkdownResponse } from "@triliumnext/commons
 import type { Request } from "express";
 
 import markdown from "../../services/export/markdown.js";
-import { markdownImportService } from "../..";
+import { markdownImportService, ValidationError } from "../..";
 
 function renderMarkdown(req: Request) {
     const { markdownContent } = req.body;
-    if (!markdownContent || typeof markdownContent !== 'string') {
-        throw new Error('markdownContent parameter is required and must be a string');
+    if (typeof markdownContent !== 'string') {
+        throw new ValidationError('markdownContent parameter is required and must be a string');
     }
     return {
         htmlContent: markdownImportService.renderToHtml(markdownContent, "")
@@ -18,8 +18,8 @@ function renderMarkdown(req: Request) {
 
 function toMarkdown(req: Request) {
     const { htmlContent } = req.body;
-    if (!htmlContent || typeof htmlContent !== 'string') {
-        throw new Error('htmlContent parameter is required and must be a string');
+    if (typeof htmlContent !== 'string') {
+        throw new ValidationError('htmlContent parameter is required and must be a string');
     }
     return {
         markdownContent: markdown.toMarkdown(htmlContent)