diff --git a/litellm/main.py b/litellm/main.py
index aec51938d0..ab8548bc7b 100644
--- a/litellm/main.py
+++ b/litellm/main.py
@@ -1933,6 +1933,7 @@ def stream_chunk_builder(chunks: list):
 
     # Extract the "content" strings from the nested dictionaries within "choices"
     content_list = []
+    combined_content = ""
 
     if "function_call" in chunks[0]["choices"][0]["delta"]:
         argument_list = []