diff --git a/src/app/components/Portfolio/Position/PositionsTable.tsx b/src/app/components/Portfolio/Position/PositionsTable.tsx
index 5921e0a..4a8324f 100644
--- a/src/app/components/Portfolio/Position/PositionsTable.tsx
+++ b/src/app/components/Portfolio/Position/PositionsTable.tsx
@@ -75,7 +75,7 @@ const PositionsTable: FunctionComponent<Props> = ({
         result = a.contract.id;
         break;
       case ContractType.Option:
-        result = (a as OptionPositionEntry).underlying.id;
+        result = (a as OptionPositionEntry).underlying?.id;
         break;
     }
     return result;