diff --git a/server/src/lib/projects.js b/server/src/lib/projects.js
index da4170e..d056b28 100644
--- a/server/src/lib/projects.js
+++ b/server/src/lib/projects.js
@@ -175,6 +175,7 @@ export function isBillable(project, task) {
 export async function loadProjects(settings, { where = '1=1', params = [] } = {}) {
   const [projects] = await pool.query(
     `SELECT p.*, c.name AS customer_name, c.short_name AS customer_short, c.color AS customer_color,
+            c.is_active AS customer_active,
             u.name AS owner_name
        FROM pulse_projects p
        JOIN pulse_customers c ON c.id = p.customer_id
@@ -270,7 +271,7 @@ export async function loadProjects(settings, { where = '1=1', params = [] } = {}
     return {
       ...project,
       display_name: displayName(settings, project, customer),
-      customer: { id: p.customer_id, name: p.customer_name, short_name: p.customer_short, color: p.customer_color },
+      customer: { id: p.customer_id, name: p.customer_name, short_name: p.customer_short, color: p.customer_color, is_active: Boolean(p.customer_active) },
       pots: projectPots,
       tasks: tasks
         .filter((t) => t.project_id === p.id)
diff --git a/src/components/booking/ExportDialog.tsx b/src/components/booking/ExportDialog.tsx
index 0a8ab40..fb23c6c 100644
--- a/src/components/booking/ExportDialog.tsx
+++ b/src/components/booking/ExportDialog.tsx
@@ -33,12 +33,20 @@ export const ExportDialog: React.FC<{
   const [busy, setBusy] = useState(false);
   const isLead = atLeast(user, 'lead');
 
+  /*
+   * Zur Auswahl stehen nur laufende Projekte aktiver Kunden. Archivierte
+   * Projekte und stillgelegte Kunden wuerden die Liste mit Aufträgen fuellen,
+   * fuer die niemand mehr einen Nachweis schreibt. Ihre Zeiten sind dadurch
+   * nicht verloren: ohne Filter exportiert der Nachweis alles, was die Person
+   * im Monat gebucht hat - und der Projektreport hat einen eigenen Export.
+   */
+  const waehlbar = useMemo(() => projects.filter((p) => p.is_active && p.customer.is_active !== false), [projects]);
   const customers = useMemo(() => {
     const map = new Map<number, string>();
-    projects.forEach((p) => map.set(p.customer.id, p.customer.name));
+    waehlbar.forEach((p) => map.set(p.customer.id, p.customer.name));
     return [...map.entries()].sort((a, b) => a[1].localeCompare(b[1], 'de'));
-  }, [projects]);
-  const projectOptions = projects.filter((p) => !customerId || p.customer_id === customerId);
+  }, [waehlbar]);
+  const projectOptions = waehlbar.filter((p) => !customerId || p.customer_id === customerId);
 
   // Monate: 18 zurueck, 2 voraus.
   const months = useMemo(() => {
diff --git a/src/types.ts b/src/types.ts
index 32fe208..cfa8088 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -178,7 +178,7 @@ export interface Project {
   owner_id: number | null;
   owner_name: string | null;
   is_active: boolean;
-  customer: { id: number; name: string; short_name: string; color: string | null };
+  customer: { id: number; name: string; short_name: string; color: string | null; is_active: boolean };
   pots: BudgetPot[];
   tasks: Task[];
   members: MemberRef[];