diff --git a/looptrader/basetypes/Strategy/singlebydeltastrategy.py b/looptrader/basetypes/Strategy/singlebydeltastrategy.py
index 5802543..6149932 100644
--- a/looptrader/basetypes/Strategy/singlebydeltastrategy.py
+++ b/looptrader/basetypes/Strategy/singlebydeltastrategy.py
@@ -592,7 +592,7 @@ def get_next_expiration(
         """Checks an option chain response for the next expiration date."""
         logger.debug("get_next_expiration")
 
-        if expirations is None or expirations == []:
+        if expirations is None or not expirations:
             logger.error("No expirations provided.")
             return None