diff --git a/src/EditorFactory.js b/src/EditorFactory.js
index 54424c78d48..dd597927710 100644
--- a/src/EditorFactory.js
+++ b/src/EditorFactory.js
@@ -140,7 +140,7 @@ const serializePlainText = (tiptap) => {
 	const doc = tiptap.getJSON()
 
 	if (doc.content.length !== 1 || typeof doc.content[0].content === 'undefined' || doc.content[0].content.length !== 1) {
-		if (doc.content[0].type === 'code_block' && typeof doc.content[0].content === 'undefined') {
+		if (doc.content[0].type === 'codeBlock' && typeof doc.content[0].content === 'undefined') {
 			return ''
 		}
 		throw new SerializeException('Failed to serialize document to plain text')