diff --git a/src/classes/generator.js b/src/classes/generator.js
index 586e1bf..e0d41e2 100644
--- a/src/classes/generator.js
+++ b/src/classes/generator.js
@@ -507,10 +507,10 @@ export default class Generator extends Common {
    * @private
    */
   _toBufferFromPDF(content) {
-    return content.toBuffer((err, buffer) => {
-      if (err) throw new Error(err);
-      return buffer;
-    });
+    return new Promise((resolve, reject) => content.toBuffer((err, buffer) => {
+      if (err) return reject(err);
+      return resolve(buffer);
+    }));
   }
 
   /**