diff --git a/react-app-internal/src/utils/parser/rehypeCallout.js b/react-app-internal/src/utils/parser/rehypeCallout.js
index bf945d9..6df2961 100644
--- a/react-app-internal/src/utils/parser/rehypeCallout.js
+++ b/react-app-internal/src/utils/parser/rehypeCallout.js
@@ -47,7 +47,8 @@ const rehypeCallout = () => {
 }
 
 function isCallout(indicatorNode) {
-  return indicatorNode.tagName === 'p' && indicatorNode.children[0].value.match(/\[!.*]/)
+  const indicatorValue = indicatorNode?.children?.[0]?.value;
+  return indicatorNode?.tagName === 'p' && typeof indicatorValue === 'string' && /\[!.*]/.test(indicatorValue)
 }
 
 function parseIndicatorNode(indicatorNode) {
@@ -97,4 +98,4 @@ function determineClass(isFoldable, foldableState) {
   return calloutClass;
 }
 
-export default rehypeCallout
\ No newline at end of file
+export default rehypeCallout
diff --git a/react-app-internal/src/utils/parser/rehypeCallout.test.js b/react-app-internal/src/utils/parser/rehypeCallout.test.js
index 29b1282..d86473e 100644
--- a/react-app-internal/src/utils/parser/rehypeCallout.test.js
+++ b/react-app-internal/src/utils/parser/rehypeCallout.test.js
@@ -85,6 +85,34 @@ describe('rehypeCallout 동작 시', () => {
     expect(inputAst).toEqual(expectedAst)
   });
 
+  it('indicator의 첫 자식이 text 노드가 아니어도 에러 없이 통과한다.', () => {
+    inputAst = u('root', [
+      {
+        type: 'element',
+        tagName: 'blockquote',
+        children: [
+          { type: 'text', value: '\n' },
+          {
+            type: 'element',
+            tagName: 'p',
+            children: [
+              {
+                type: 'element',
+                tagName: 'strong',
+                children: [{ type: 'text', value: '[!info]' }],
+              },
+              { type: 'text', value: '내용' },
+            ],
+          },
+        ],
+      }
+    ]);
+    expectedAst = structuredClone(inputAst);
+
+    expect(() => rehypeCallout()(inputAst)).not.toThrow();
+    expect(inputAst).toEqual(expectedAst);
+  });
+
   it('콜아웃 지시자가 있는 blockquote 태그의 경우 rehype 된다.', () => {
     inputAst = u('root', [
       {
@@ -353,4 +381,4 @@ describe('rehypeCallout 동작 시', () => {
     
     expect(found).true
   });
-});
\ No newline at end of file
+});