diff --git a/api/core/entities/knowledge_entities.py b/api/core/entities/knowledge_entities.py
index b9ca7414dc..bed3a35400 100644
--- a/api/core/entities/knowledge_entities.py
+++ b/api/core/entities/knowledge_entities.py
@@ -1,4 +1,4 @@
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 
 
 class PreviewDetail(BaseModel):
@@ -20,7 +20,7 @@ class IndexingEstimate(BaseModel):
 class PipelineDataset(BaseModel):
     id: str
     name: str
-    description: str
+    description: str | None = Field(default="", description="knowledge dataset description")
     chunk_structure: str