diff --git a/internal/db/gist.go b/internal/db/gist.go
index de12d58..fdd56ab 100644
--- a/internal/db/gist.go
+++ b/internal/db/gist.go
@@ -377,7 +377,6 @@ func (gist *Gist) UpdatePreviewAndCount() error {
 			gist.Preview = file.Content
 		}
 
-		gist.Preview = file.Content
 		gist.PreviewFilename = file.Filename
 	}
 
diff --git a/public/admin.ts b/public/admin.ts
index cb7a69e..a044a8d 100644
--- a/public/admin.ts
+++ b/public/admin.ts
@@ -11,7 +11,9 @@ const setSetting = (key: string, value: string) => {
     const data = new URLSearchParams();
     data.append('key', key);
     data.append('value', value);
-    data.append('_csrf', ((document.getElementsByName('_csrf')[0] as HTMLInputElement).value));
+    if (document.getElementsByName('_csrf').length !== 0) {
+        data.append('_csrf', ((document.getElementsByName('_csrf')[0] as HTMLInputElement).value));
+    }
     return fetch('/admin-panel/set-config', {
         method: 'PUT',
         credentials: 'same-origin',