diff --git a/frappe/client.py b/frappe/client.py
index 1ad84b4734..ea7519894e 100644
--- a/frappe/client.py
+++ b/frappe/client.py
@@ -108,8 +108,9 @@ def set_default(key, value, parent=None):
 	frappe.clear_cache(user=frappe.session.user)
 
 @frappe.whitelist()
-def make_width_property_setter():
-	doc = json.loads(frappe.form_dict)
+def make_width_property_setter(doc):
+	if isinstance(doc, basestring):
+		doc = json.loads(doc)
 	if doc["doctype"]=="Property Setter" and doc["property"]=="width":
 		frappe.get_doc(doc).insert(ignore_permissions = True)
 
diff --git a/frappe/public/js/frappe/misc/tools.js b/frappe/public/js/frappe/misc/tools.js
index 1a8d6195d4..ec90d92efd 100644
--- a/frappe/public/js/frappe/misc/tools.js
+++ b/frappe/public/js/frappe/misc/tools.js
@@ -124,7 +124,7 @@ frappe.slickgrid_tools = {
 					frappe.call({
 						method:"frappe.client.make_width_property_setter",
 						args: {
-							doclist: [{
+							doc: {
 								doctype:'Property Setter',
 								doctype_or_field: 'DocField',
 								doc_type: col.docfield.parent,
@@ -132,7 +132,7 @@ frappe.slickgrid_tools = {
 								property: 'width',
 								value: col.width,
 								"__islocal": 1
-							}]
+							}
 						}
 					});
 					col.previousWidth = col.width;