Bugfix/handle X-ray rule exception when market price is missing (#6397)

* Handle X-ray rule exception when market price is missing

* Update changelog

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Fixed
+
+- Fixed an exception by adding a fallback for missing market price values on the _X-ray_ page
+
 ## 2.243.0 - 2026-02-23
 
 ### Changed

apps/api/src/models/rule.ts

@@ -57,7 +57,7 @@ export abstract class Rule<T extends RuleSettings> implements RuleInterface<T> {
             previousValue +
             this.exchangeRateDataService.toCurrency(
               new Big(currentValue.quantity)
-                .mul(currentValue.marketPrice)
+                .mul(currentValue.marketPrice ?? 0)
                 .toNumber(),
               currentValue.currency,
               baseCurrency