diff --git a/ckeditor_filebrowser_filer/static/ckeditor/ckeditor/plugins/filerimage/dialogs/filerImageDialog.js b/ckeditor_filebrowser_filer/static/ckeditor/ckeditor/plugins/filerimage/dialogs/filerImageDialog.js
index 0200ff6..5e12fcb 100755
--- a/ckeditor_filebrowser_filer/static/ckeditor/ckeditor/plugins/filerimage/dialogs/filerImageDialog.js
+++ b/ckeditor_filebrowser_filer/static/ckeditor/ckeditor/plugins/filerimage/dialogs/filerImageDialog.js
@@ -319,9 +319,20 @@
 					// Flag the insertion mode for later use.
 					this.insertMode = true;
 				}
-				else
+				else {
 					this.insertMode = false;
 
+                    // try to guess filer_id from canonical url.
+                    var filer_id = element.getAttribute('filer_id');
+                    if (!filer_id ) {
+                        var src = element.getAttribute('src');
+                        if (src.startsWith(editor.canonical_url_prefix)) {
+                            var parts = src.split('/');
+                            element.setAttribute('filer_id', parseInt(parts[parts.length-2]));
+                        }
+                    }
+                }
+
 				// Store the reference to the <img> element in an internal property, for later use.
 				this.element = element;
 
diff --git a/ckeditor_filebrowser_filer/static/ckeditor/ckeditor/plugins/filerimage/plugin.js b/ckeditor_filebrowser_filer/static/ckeditor/ckeditor/plugins/filerimage/plugin.js
index 3fee423..8715a00 100755
--- a/ckeditor_filebrowser_filer/static/ckeditor/ckeditor/plugins/filerimage/plugin.js
+++ b/ckeditor_filebrowser_filer/static/ckeditor/ckeditor/plugins/filerimage/plugin.js
@@ -66,10 +66,16 @@
                 }
             });
 
+            // jQuery.get('/filebrowser_filer/url_reverse/',
+            //     { url_name: 'admin:filer-directory_listing-last' },
+            //     function(data) {
+
+            // });
+
             jQuery.get('/filebrowser_filer/url_reverse/',
-                { url_name: 'admin:filer-directory_listing-last' },
+                'url_name=canonical&args=0&args=1',
                 function(data) {
-
+                    editor.canonical_url_prefix = data.substring(0, data.length - 5);
             });
 
             var dialog = CKEDITOR.dialog.getCurrent();
diff --git a/ckeditor_filebrowser_filer/views.py b/ckeditor_filebrowser_filer/views.py
index c97d6cc..d3783ee 100644
--- a/ckeditor_filebrowser_filer/views.py
+++ b/ckeditor_filebrowser_filer/views.py
@@ -4,7 +4,7 @@
 
 from django import http
 from django.conf import settings
-from django.core import urlresolvers
+from django import urls
 from django.http import HttpResponseRedirect
 
 from filer.models import File
@@ -49,10 +49,10 @@ def url_reverse(request):
         data = getattr(request, request.method) 
         url_name = data.get('url_name') 
         try: 
-            path = urlresolvers.reverse(url_name, args=data.getlist('args')) 
-            (view_func, args, kwargs) = urlresolvers.resolve(path)
+            path = urls.reverse(url_name, args=data.getlist('args')) 
+            (view_func, args, kwargs) = urls.resolve(path)
             return http.HttpResponse(path, content_type='text/plain')
-        except urlresolvers.NoReverseMatch: 
+        except urls.NoReverseMatch: 
             return http.HttpResponse('Error', content_type='text/plain')
     return http.HttpResponseNotAllowed(('GET', 'POST'))
 
@@ -135,4 +135,4 @@ def serve_image(request, image_id, thumb_options=None, width=None, height=None):
     if thumb:
         return server.serve(request, file_obj=thumb, save_as=False)
     else:
-        return HttpResponseRedirect(url)
\ No newline at end of file
+        return HttpResponseRedirect(url)