diff --git a/tradingagents/cross_asset_correlation/multi_asset_processor.py b/tradingagents/cross_asset_correlation/multi_asset_processor.py
index 56bb3839..90b7086f 100644
--- a/tradingagents/cross_asset_correlation/multi_asset_processor.py
+++ b/tradingagents/cross_asset_correlation/multi_asset_processor.py
@@ -375,8 +375,8 @@ class MultiAssetProcessor:
         
         # Ensure prices are positive
         if (price_data <= 0).any().any():
-            warnings.warn("Some prices are non-positive. Taking absolute values.")
-            price_data = price_data.abs()
+            warnings.warn("Non-positive prices found. Replacing with NaN.")
+            price_data[price_data <= 0] = np.nan
             
         return price_data