diff --git a/packages/ui/src/views/assistants/custom/CustomAssistantConfigurePreview.jsx b/packages/ui/src/views/assistants/custom/CustomAssistantConfigurePreview.jsx
index 6356f854..044d8eb8 100644
--- a/packages/ui/src/views/assistants/custom/CustomAssistantConfigurePreview.jsx
+++ b/packages/ui/src/views/assistants/custom/CustomAssistantConfigurePreview.jsx
@@ -319,7 +319,10 @@ const CustomAssistantConfigurePreview = () => {
 
                 const docStoreOption = documentStoreOptions.find((ds) => ds.name === selectedDocumentStores[i].id)
                 // convert to small case and replace space with underscore
-                const name = (docStoreOption?.label || '').toLowerCase().replace(/ /g, '_')
+                const name = (docStoreOption?.label || '')
+                    .toLowerCase()
+                    .replace(/ /g, '_')
+                    .replace(/[^a-z0-9_-]/g, '')
                 const desc = selectedDocumentStores[i].description || docStoreOption?.description || ''
 
                 set(retrieverToolNodeData, 'inputs', {