diff --git a/client/components/Reader/share/bookManager.js b/client/components/Reader/share/bookManager.js
index 3ef65532..71c77381 100644
--- a/client/components/Reader/share/bookManager.js
+++ b/client/components/Reader/share/bookManager.js
@@ -464,7 +464,7 @@ class BookManager {
 
     addEventListener(listener) {
         if (this.eventListeners.indexOf(listener) < 0)
-            this.eventListeners.push(listener);        
+            this.eventListeners.push(listener);
     }
 
     removeEventListener(listener) {