diff --git a/org.adempiere.base/src/org/compiere/model/MLookupFactory.java b/org.adempiere.base/src/org/compiere/model/MLookupFactory.java
index e4fa9613e5..2dd053f3c9 100644
--- a/org.adempiere.base/src/org/compiere/model/MLookupFactory.java
+++ b/org.adempiere.base/src/org/compiere/model/MLookupFactory.java
@@ -610,6 +610,8 @@ public class MLookupFactory
 			for (LookupDisplayColumn ldc : list) {
 				retValue.lookupDisplayColumnNames.add(ldc.ColumnName);
 			}
+		} else {
+			retValue.lookupDisplayColumnNames = new ArrayList<>(retValue.lookupDisplayColumns); 
 		}
 		s_cacheRefTable.put(key.toString(), retValue.cloneIt());
 		return retValue;