diff --git a/quartz/plugins/transformers/ofm.ts b/quartz/plugins/transformers/ofm.ts
index 9f51957b3..0e99ada13 100644
--- a/quartz/plugins/transformers/ofm.ts
+++ b/quartz/plugins/transformers/ofm.ts
@@ -414,8 +414,8 @@ export const ObsidianFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options>
                 return
               }
 
-              // find first line
-              const firstChild = node.children[0]
+              // find first line and callout content
+              const [firstChild, calloutContent] = node.children
               if (firstChild.type !== "paragraph" || firstChild.children[0]?.type !== "text") {
                 return
               }
@@ -425,8 +425,6 @@ export const ObsidianFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options>
               const [firstLine, ...remainingLines] = text.split("\n")
               const remainingText = remainingLines.join("\n")
 
-              const [_, calloutContent] = node.children
-
               const match = firstLine.match(calloutRegex)
               if (match && match.input) {
                 const [calloutDirective, typeString, calloutMetaData, collapseChar] = match