diff --git a/src/PdfCreator.ts b/src/PdfCreator.ts
index 9c9cdff..0f74596 100644
--- a/src/PdfCreator.ts
+++ b/src/PdfCreator.ts
@@ -20,11 +20,13 @@ export class PdfCreator {
      * Initializes i18n(ext), Handlebars and puppeteer.
      */
     constructor() {
-        this.init().then(() => {
-            return this;
-        })
+        this.init();
     }
 
+    /**
+     * Main constructor.
+     * Initializes i18n(ext), Handlebars and puppeteer.
+     */
     public async init() {
         await i18next
             .use(Backend)
diff --git a/src/controllers/PdfController.ts b/src/controllers/PdfController.ts
index 0f6ac16..b99e486 100644
--- a/src/controllers/PdfController.ts
+++ b/src/controllers/PdfController.ts
@@ -11,10 +11,15 @@ import { PdfCreator } from '../PdfCreator';
 @JsonController()
 export class PdfController {
     private pdf: PdfCreator = new PdfCreator();
+    private initialized: boolean = false;
 
     @Post('/contracts')
     @OpenAPI({ description: "Generate Sponsoring contract pdfs from runner objects.<br>You can choose your prefered locale by passing the 'locale' query-param." })
     async generateContracts(@Body({ validate: true }) runners: Runner | Runner[], @Res() res: any, @QueryParam("locale") locale: string) {
+        if (!this.initialized) {
+            await this.pdf.init();
+            this.initialized = true;
+        }
         if (!Array.isArray(runners)) {
             runners = [runners];
         }