--- a/src/pyams_file/zmi/image.py	Wed Mar 28 15:48:24 2018 +0200
+++ b/src/pyams_file/zmi/image.py	Fri Mar 30 15:36:35 2018 +0200
@@ -679,6 +679,7 @@
     """Image resize form, AJAX renderer"""
 
     def update_content(self, content, data):
+        data = data.get(self, data)
         self.context.resize(data.get('width'), data.get('height'), data.get('keep_ratio'))
 
     def get_ajax_output(self, changes):