1 files changed, 6 insertions, 0 deletions
diff --git a/library/cropperjs/docs/examples/customize-preview.html b/library/cropperjs/docs/examples/customize-preview.html
index 72a108f8a..51d1e1b42 100644
--- a/library/cropperjs/docs/examples/customize-preview.html
+++ b/library/cropperjs/docs/examples/customize-preview.html
@@ -77,6 +77,7 @@
     window.addEventListener('DOMContentLoaded', function () {
       var image = document.querySelector('#image');
       var previews = document.querySelectorAll('.preview');
+      var previewReady = false;
       var cropper = new Cropper(image, {
           ready: function () {
             var clone = this.cloneNode();
@@ -94,9 +95,14 @@
             each(previews, function (elem) {
               elem.appendChild(clone.cloneNode());
             });
+            previewReady = true;
           },
 
           crop: function (event) {
+            if (!previewReady) {
+              return;
+            }
+
             var data = event.detail;
             var cropper = this.cropper;
             var imageData = cropper.getImageData();