diff --git a/frontend/src/components/OnlyOfficeEditor.tsx b/frontend/src/components/OnlyOfficeEditor.tsx
index 87fbc85..36e7807 100644
--- a/frontend/src/components/OnlyOfficeEditor.tsx
+++ b/frontend/src/components/OnlyOfficeEditor.tsx
@@ -54,7 +54,7 @@ export default function OnlyOfficeEditor({ file, type, onClose }: OnlyOfficeEdit
   const config = {
     document: {
       fileType: file.name.split('.').pop() || 'docx',
-      key: `${file.path}_${new Date(file.mod_time).getTime()}`,
+      key: `${file.path.replace(/[^a-zA-Z0-9\-_=]/g, '_')}_${new Date(file.mod_time).getTime()}`.substring(0, 128),
       title: file.name,
       url: fileUrl,
     },