diff --git a/news/69.bugfix b/news/69.bugfix
new file mode 100644
index 0000000..639d28b
--- /dev/null
+++ b/news/69.bugfix
@@ -0,0 +1 @@
+Fix 'Wrong contained type' error for new blog posts with no tags created using plone.restapi. @davisagli
diff --git a/src/collective/blog/behaviors/tags.py b/src/collective/blog/behaviors/tags.py
index 24a36b4..1f07380 100644
--- a/src/collective/blog/behaviors/tags.py
+++ b/src/collective/blog/behaviors/tags.py
@@ -20,6 +20,7 @@ class IBlogTags(model.Schema):
         title=_("label_blog_tags", default="Tags"),
         value_type=schema.TextLine(),
         required=False,
+        default=(),
         missing_value=(),
     )
     directives.widget(