diff --git a/sdkjs-plugins/content/zotero/scripts/csl/citation/citation-item-data.js b/sdkjs-plugins/content/zotero/scripts/csl/citation/citation-item-data.js
index cd2934f1..26b69efc 100644
--- a/sdkjs-plugins/content/zotero/scripts/csl/citation/citation-item-data.js
+++ b/sdkjs-plugins/content/zotero/scripts/csl/citation/citation-item-data.js
@@ -466,6 +466,18 @@ CitationItemData.prototype.fillFromObject = function (itemDataObject) {
             if (creator.lastName) {
                 author.family = creator.lastName;
             }
+            let bHasAuthor = self._author.some(function (a) {
+                if (a.family !== author.family && (a.family || author.family)) {
+                    return false;
+                }
+                if (a.given !== author.given && (a.given || author.given)) {
+                    return false;
+                }
+                return true;
+            });
+            if (bHasAuthor) {
+                return;
+            }
             self._author.push(author);
         },
         this);
diff --git a/sdkjs-plugins/content/zotero/scripts/csl/citation/citation-item.js b/sdkjs-plugins/content/zotero/scripts/csl/citation/citation-item.js
index 314ca620..e6191902 100644
--- a/sdkjs-plugins/content/zotero/scripts/csl/citation/citation-item.js
+++ b/sdkjs-plugins/content/zotero/scripts/csl/citation/citation-item.js
@@ -11,6 +11,14 @@
  * @property {boolean} [`suppress-author`]
  */
 
+/**
+ * @typedef {Object} InfoForCitationCluster
+ * @property {string|number} id
+ * @property {boolean} `suppress-author`
+ * @property {string} [prefix]
+ * @property {string} [suffix]
+ */
+
 /**
  * @param {string|number} id
  */
diff --git a/sdkjs-plugins/content/zotero/scripts/csl/citation/citation.js b/sdkjs-plugins/content/zotero/scripts/csl/citation/citation.js
index 443d346a..49a2ff65 100644
--- a/sdkjs-plugins/content/zotero/scripts/csl/citation/citation.js
+++ b/sdkjs-plugins/content/zotero/scripts/csl/citation/citation.js
@@ -1,14 +1,6 @@
 // @ts-check
 /// <reference path="./citation-item.js" />
 
-/**
- * @typedef {Object} InfoForCitationCluster
- * @property {string|number} id
- * @property {boolean} `suppress-author`
- * @property {string} [prefix]
- * @property {string} [suffix]
- */
-
 /**
  * @typedef {Object} CitationJsonData
  * @property {string} key