diff --git a/packages/core/src/utils/content-block.ts b/packages/core/src/utils/content-block.ts
index f57827e19..58443c460 100644
--- a/packages/core/src/utils/content-block.ts
+++ b/packages/core/src/utils/content-block.ts
@@ -26,7 +26,7 @@ export function extractInternalLinks(block: ContentBlock) {
 
   const links: InternalLinkWithOffset[] = [];
   for (const match of matches || []) {
-    if (!match.index) continue;
+    if (match.index === undefined) continue;
     const url = match[1].slice(0, match[1].indexOf("|"));
     const text = match[1].slice(match[1].indexOf("|") + 1);
     const link = parseInternalLink(url);