diff --git a/main.js b/main.js
index b735de20..e89648b6 100644
--- a/main.js
+++ b/main.js
@@ -35399,7 +35399,7 @@ async function buildMainG(plugin) {
         db.start2G("addFrontmatterToGraph");
         frontms.forEach((page) => {
             BC_ALTS.forEach((alt) => {
-                if (page[alt] !== undefined)
+                if (page[alt] !== undefined && page[alt] !== null)
                     eligableAlts[alt].push(page);
             });
             const basename = getDVBasename(page.file);
diff --git a/src/refreshIndex.ts b/src/refreshIndex.ts
index 40f7560e..9a94f132 100644
--- a/src/refreshIndex.ts
+++ b/src/refreshIndex.ts
@@ -198,7 +198,8 @@ export async function buildMainG(plugin: BCPlugin): Promise<MultiGraph> {
     db.start2G("addFrontmatterToGraph");
     frontms.forEach((page) => {
       BC_ALTS.forEach((alt) => {
-        if (page[alt] !== undefined) eligableAlts[alt].push(page);
+        if (page[alt] !== undefined && page[alt] !== null)
+          eligableAlts[alt].push(page);
       });
 
       const basename = getDVBasename(page.file);