diff --git a/llm_server/database/database.py b/llm_server/database/database.py
index fc1aa21..27a059c 100644
--- a/llm_server/database/database.py
+++ b/llm_server/database/database.py
@@ -11,6 +11,9 @@ from llm_server.llm import get_token_count
 
 
 def log_prompt(ip: str, token: str, prompt: str, response: Union[str, None], gen_time: Union[int, float, None], parameters: dict, headers: dict, backend_response_code: int, request_url: str, backend_url: str, response_tokens: int = None, is_error: bool = False):
+    assert isinstance(prompt, str)
+    assert isinstance(backend_url, str)
+
     def background_task():
         nonlocal ip, token, prompt, response, gen_time, parameters, headers, backend_response_code, request_url, backend_url, response_tokens, is_error
         # Try not to shove JSON into the database.