diff --git a/phi/knowledge/base.py b/phi/knowledge/base.py
index 556b1a8aa8..8c71f1fc3b 100644
--- a/phi/knowledge/base.py
+++ b/phi/knowledge/base.py
@@ -84,6 +84,7 @@ def load(
             else:
                 # Filter out documents which already exist in the vector db
                 if skip_existing:
+                    document_list = {document.content: document for document in document_list}.values()
                     documents_to_load = [
                         document for document in document_list if not self.vector_db.doc_exists(document)
                     ]