diff --git a/pybossa/themes/default/static/js/image_crop.js b/pybossa/themes/default/static/js/image_crop.js
index c140911..431c8a9 100644
--- a/pybossa/themes/default/static/js/image_crop.js
+++ b/pybossa/themes/default/static/js/image_crop.js
@@ -17,19 +17,28 @@
 
         oFReader.onload = function (oFREvent) {
 
-            document.getElementById("uploadPreview").src = oFREvent.target.result;
-            var img = document.getElementById('uploadPreview'); 
-            //or however you get a handle to the IMG
-            var width = img.clientWidth;
-            var height = img.clientHeight;
-            if (width > height) {
-                width = height - 100;
-            }
-            else {
-                height = width - 100;
-            }
-
             jQuery(function($) {
+                document.getElementById("uploadPreview").src = oFREvent.target.result;
+                var img = document.getElementById('uploadPreview');
+                var width = img.clientWidth;
+                var height = img.clientHeight;
+               
+            	// Check if Jcrop preview has a image and clears the previous set up
+                var previewImg = $('#uploadPreview + .jcrop-holder img')[0];
+                if (previewImg) {
+                	width = previewImg.clientWidth;
+                	height = previewImg.clientHeight; 
+            		$('#uploadPreview').data('Jcrop').destroy();
+            		$('#uploadPreview').removeAttr("style");
+                }
+                
+                if (width > height) {
+                    width = height - 100;
+                }
+                else {
+                    height = width - 100;
+                }
+            	
                 $('#uploadPreview').Jcrop({
                     onSelect:    _updateCoords,
                     onChange:    _updateCoords,
@@ -42,7 +51,6 @@
                                     (height/ 2)],
                     aspectRatio: 1,
                     boxWidth: 450
-
                 });
             });
         };
--
libgit2 0.21.2