diff --git a/CHANGELOG.md b/CHANGELOG.md
index f23e1af95..be6630ae1 100644
--- a/CHANGELOG.md
+++ b/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
+
+- Resolved an exception in the portfolio details endpoint when an asset profile is unmatched
+
 ## 3.3.0 - 2026-05-14
 
 ### Added
diff --git a/apps/api/src/app/portfolio/portfolio.service.ts b/apps/api/src/app/portfolio/portfolio.service.ts
index 60b413cf9..ade683d41 100644
--- a/apps/api/src/app/portfolio/portfolio.service.ts
+++ b/apps/api/src/app/portfolio/portfolio.service.ts
@@ -36,7 +36,12 @@ import {
   TAG_ID_EXCLUDE_FROM_ANALYSIS,
   UNKNOWN_KEY
 } from '@ghostfolio/common/config';
-import { DATE_FORMAT, getSum, parseDate } from '@ghostfolio/common/helper';
+import {
+  DATE_FORMAT,
+  getAssetProfileIdentifier,
+  getSum,
+  parseDate
+} from '@ghostfolio/common/helper';
 import {
   AccountsResponse,
   Activity,
@@ -64,7 +69,7 @@ import {
 } from '@ghostfolio/common/types';
 import { PerformanceCalculationType } from '@ghostfolio/common/types/performance-calculation-type.type';
 
-import { Inject, Injectable } from '@nestjs/common';
+import { Inject, Injectable, Logger } from '@nestjs/common';
 import { REQUEST } from '@nestjs/core';
 import {
   Account,
@@ -558,9 +563,17 @@ export class PortfolioService {
     const cashSymbolProfiles = this.getCashSymbolProfiles(cashDetails);
     symbolProfiles.push(...cashSymbolProfiles);
 
-    const symbolProfileMap: { [symbol: string]: EnhancedSymbolProfile } = {};
+    const symbolProfileMap: {
+      [assetProfileIdentifier: string]: EnhancedSymbolProfile;
+    } = {};
+
     for (const symbolProfile of symbolProfiles) {
-      symbolProfileMap[symbolProfile.symbol] = symbolProfile;
+      symbolProfileMap[
+        getAssetProfileIdentifier({
+          dataSource: symbolProfile.dataSource,
+          symbol: symbolProfile.symbol
+        })
+      ] = symbolProfile;
     }
 
     const portfolioItemsNow: { [symbol: string]: TimelinePosition } = {};
@@ -571,6 +584,7 @@ export class PortfolioService {
     for (const {
       activitiesCount,
       currency,
+      dataSource,
       dateOfFirstActivity,
       dividend,
       grossPerformance,
@@ -600,7 +614,17 @@ export class PortfolioService {
         }
       }
 
-      const assetProfile = symbolProfileMap[symbol];
+      const assetProfile =
+        symbolProfileMap[getAssetProfileIdentifier({ dataSource, symbol })];
+
+      if (!assetProfile) {
+        Logger.warn(
+          `Asset profile not found for ${symbol} (${dataSource})`,
+          'PortfolioService'
+        );
+
+        continue;
+      }
 
       let markets: PortfolioPosition['markets'];
       let marketsAdvanced: PortfolioPosition['marketsAdvanced'];