diff --git a/docs/src/demos/Extensions/TextAlign/index.vue b/docs/src/demos/Extensions/TextAlign/index.vue
index 2c0b5e77..58af3f46 100644
--- a/docs/src/demos/Extensions/TextAlign/index.vue
+++ b/docs/src/demos/Extensions/TextAlign/index.vue
@@ -43,7 +43,7 @@ export default {
         TextAlign(),
       ],
       content: `
-        <h1>Heading</h1>
+        <h2>Heading</h2>
         <p style="text-align: center">first paragraph</p>
         <p style="text-align: right">second paragraph</p>
       `,
diff --git a/packages/core/src/utils/getSchema.ts b/packages/core/src/utils/getSchema.ts
index a892d470..2320d807 100644
--- a/packages/core/src/utils/getSchema.ts
+++ b/packages/core/src/utils/getSchema.ts
@@ -25,7 +25,14 @@ function injectExtensionAttributes(parseRule: ParseRule, extensionAttributes: Ex
   return {
     ...parseRule,
     getAttrs: node => {
-      const oldAttributes = parseRule.getAttrs ? parseRule.getAttrs(node) : {}
+      const oldAttributes = parseRule.getAttrs
+        ? parseRule.getAttrs(node)
+        : parseRule.attrs
+
+      if (oldAttributes === false) {
+        return false
+      }
+
       const newAttributes = extensionAttributes
         .filter(item => item.attribute.rendered)
         .reduce((items, item) => ({
diff --git a/packages/extension-text-align/index.ts b/packages/extension-text-align/index.ts
index 40a05e4f..9f44f272 100644
--- a/packages/extension-text-align/index.ts
+++ b/packages/extension-text-align/index.ts
@@ -22,7 +22,7 @@ const TextAlign = createExtension({
               style: `text-align: ${attributes.textAlign}`,
             }),
             parseHTML: node => ({
-              textAlign: node.style.textAlign,
+              textAlign: node.style.textAlign || 'left',
             }),
           },
         },