diff --git a/kimi_k2_tool_parser.py b/kimi_k2_tool_parser.py
index 137860e..6b1d298 100644
--- a/kimi_k2_tool_parser.py
+++ b/kimi_k2_tool_parser.py
@@ -554,6 +554,6 @@ class KimiK2ToolParser(ToolParser):
                     if new_after:
                         return DeltaMessage(content=new_after)
                     break
-            return DeltaMessage(content="") if delta_text else None
+            return None
 
         return None
\ No newline at end of file