diff --git a/reflex/components/markdown/markdown.py b/reflex/components/markdown/markdown.py
index 73bee1de7..00e782399 100644
--- a/reflex/components/markdown/markdown.py
+++ b/reflex/components/markdown/markdown.py
@@ -381,7 +381,7 @@ class Markdown(Component):
                     component.component_fn(*component.get_prop_vars())
                 )
             )
-        else:
+        elif isinstance(component, Component):
             for child in component.children:
                 custom_code_list.extend(
                     self._get_map_fn_custom_code_from_children(child)
diff --git a/tests/units/components/datadisplay/test_code.py b/tests/units/components/datadisplay/test_code.py
index 809c68fe5..6b7168756 100644
--- a/tests/units/components/datadisplay/test_code.py
+++ b/tests/units/components/datadisplay/test_code.py
@@ -11,22 +11,3 @@ def test_code_light_dark_theme(theme, expected):
     code_block = CodeBlock.create(theme=theme)
 
     assert code_block.theme._js_expr == expected  # type: ignore
-
-
-def generate_custom_code(language, expected_case):
-    return f"SyntaxHighlighter.registerLanguage('{language}', {expected_case})"
-
-
-@pytest.mark.parametrize(
-    "language, expected_case",
-    [
-        ("python", "python"),
-        ("firestore-security-rules", "firestoreSecurityRules"),
-        ("typescript", "typescript"),
-    ],
-)
-def test_get_custom_code(language, expected_case):
-    code_block = CodeBlock.create(language=language)
-    assert code_block._get_custom_code() == generate_custom_code(
-        language, expected_case
-    )