diff --git a/cashu/mint/app.py b/cashu/mint/app.py
index 50058f21..fe7737bb 100644
--- a/cashu/mint/app.py
+++ b/cashu/mint/app.py
@@ -94,12 +94,13 @@ async def catch_exceptions(request: Request, call_next):
         except Exception:
             err_message = e.args[0] if e.args else "Unknown error"
 
-        if isinstance(e, CashuError):
+        if isinstance(e, CashuError) or isinstance(e.args[0], CashuError):
             logger.error(f"CashuError: {err_message}")
+            code = e.code if isinstance(e, CashuError) else e.args[0].code
             # return with cors headers
             return JSONResponse(
                 status_code=status.HTTP_400_BAD_REQUEST,
-                content={"detail": err_message, "code": e.code},
+                content={"detail": err_message, "code": code},
                 headers=CORS_HEADERS,
             )
         logger.error(f"Exception: {err_message}")