diff --git a/src/models.py b/src/models.py
index f4422ce..d00ef07 100644
--- a/src/models.py
+++ b/src/models.py
@@ -91,7 +91,7 @@ class InsuranceChatRequest(BaseModel):
     userId: str | int | None = None
     message: str = Field(..., description="User message")
     session_id: str | None = Field(None, description="Chat session ID")
-    context: InsuranceChatContext | None
+    context: InsuranceChatContext | None = None
 
 class Source(BaseModel):
     plan_name: str