diff --git a/strategy_register.py b/strategy_register.py
index 7fbc0e7..3e17ef7 100644
--- a/strategy_register.py
+++ b/strategy_register.py
@@ -102,6 +102,7 @@ def _count_active_trends(conn, cfg: dict) -> int:
 
 
 def _roll_preview_response(cfg: dict, data: dict, json_mode: bool = False) -> dict:
+    get_db = cfg["get_db"]
     symbol = cfg["normalize_symbol_input"](data.get("symbol") or "")
     if not symbol:
         return {"ok": False, "msg": "请选择或填写币种"}