diff --git a/disqus/rest-api/class-disqus-rest-api.php b/disqus/rest-api/class-disqus-rest-api.php
index 01b4a53..aa1d433 100644
--- a/disqus/rest-api/class-disqus-rest-api.php
+++ b/disqus/rest-api/class-disqus-rest-api.php
@@ -786,7 +786,8 @@ private function comment_data_from_post( $post ) {
             if ( isset( $author['email'] ) ) {
                 $author_email = $author['email'];
             } elseif ( isset( $author['isAnonymous'] ) && $author['isAnonymous'] ) {
-                $author_email = 'anonymized-' . md5( $author['name'] ) . '@disqus.com';
+                $author_name = isset( $author['name'] ) && null !== $author['name'] ? $author['name'] : 'anonymous';
+                $author_email = 'anonymized-' . md5( $author_name ) . '@disqus.com';
             } elseif ( isset( $author['id'] ) ) {
                 $author_email = 'user-' . $author['id'] . '@disqus.com';
             }