diff --git a/lib/server/docs.plugin.js b/lib/server/docs.plugin.js
index 2977010..6f66583 100644
--- a/lib/server/docs.plugin.js
+++ b/lib/server/docs.plugin.js
@@ -50,7 +50,8 @@ class DocsPlugin {
         const bar = progress.defaultBar();
         bar.start(this.docs.length, 0, { prefix: 'rendering images', suffix: '-' });
         for (const doc of this.docs) {
-            if (!doc?.metadata.permalink) {
+            console.log("doc", doc);
+            if (!doc.metadata.permalink || !doc.metadata.permalink.length) {
                 continue;
             }
             const document = new document_1.Document(this.getHtmlPath(doc));
diff --git a/src/server/docs.plugin.ts b/src/server/docs.plugin.ts
index 72a020a..96122d4 100644
--- a/src/server/docs.plugin.ts
+++ b/src/server/docs.plugin.ts
@@ -69,7 +69,7 @@ export class DocsPlugin {
     bar.start(this.docs.length, 0, {prefix: 'rendering images', suffix: '-'})
     for (const doc of this.docs) {
       console.log("doc", doc)
-      if (!doc?.metadata.permalink) {
+      if (!doc.metadata.permalink || !doc.metadata.permalink.length) {
         continue;
       }
       const document = new Document(this.getHtmlPath(doc)!)