diff --git a/gui/src/main/app-error.tsx b/gui/src/main/app-error.tsx
index 27814d3..7f899f5 100644
--- a/gui/src/main/app-error.tsx
+++ b/gui/src/main/app-error.tsx
@@ -34,7 +34,7 @@ export function PageErrorBoundary() {
   )
 }
 
-const isFGCTrackerError = (error: unknown) => error instanceof Object && 'translationKey' in error
+const isFGCTrackerError = (error: unknown) => error instanceof Object && 'localizationKey' in error
 
 function useFGCTrackerError() {
   const thrownError = useRouteError()
diff --git a/pkg/model/error.go b/pkg/model/error.go
index 09aae6d..00e6c81 100644
--- a/pkg/model/error.go
+++ b/pkg/model/error.go
@@ -74,8 +74,11 @@ type FGCTrackerError struct {
 }
 
 func NewError(fmtErr *FGCTrackerError, err error) *FGCTrackerError {
-	fmtErr.InnerError = fmt.Errorf("%w: %w", fmtErr.InnerError, err)
-	return fmtErr
+	return &FGCTrackerError{
+		LocalizationKey: fmtErr.LocalizationKey,
+		Message:         fmtErr.Message,
+		InnerError:      fmt.Errorf("%w: %w", fmtErr.InnerError, err),
+	}
 }
 
 func newError(key ErrorLocalizationKey, err error) *FGCTrackerError {