Bugfix/improve error handling in position api endpoint (#607)

* Add guards

* Update changelog

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Hid the data provider warning while loading
 - Fixed an exception with the market state caused by a failed data provider request
+- Fixed an exception in the portfolio position endpoint
 - Fixed the reload of the position detail dialog (with query parameters)
 
 ## 1.98.0 - 29.12.2021

apps/api/src/app/portfolio/portfolio.service.ts

@@ -447,17 +447,17 @@ export class PortfolioService {
       // Convert investment, gross and net performance to currency of user
       const userCurrency = this.request.user.Settings.currency;
       const investment = this.exchangeRateDataService.toCurrency(
-        position.investment.toNumber(),
+        position.investment?.toNumber(),
         currency,
         userCurrency
       );
       const grossPerformance = this.exchangeRateDataService.toCurrency(
-        position.grossPerformance.toNumber(),
+        position.grossPerformance?.toNumber(),
         currency,
         userCurrency
       );
       const netPerformance = this.exchangeRateDataService.toCurrency(
-        position.netPerformance.toNumber(),
+        position.netPerformance?.toNumber(),
         currency,
         userCurrency
       );