diff --git a/frappe/client.py b/frappe/client.py
index ea7519894e..9d7312dfce 100644
--- a/frappe/client.py
+++ b/frappe/client.py
@@ -42,7 +42,11 @@ def set_value(doctype, name, fieldname, value):
 		child.set(fieldname, value)
 	else:
 		doc = frappe.get_doc(doctype, name)
-		doc.set(fieldname, value)
+		df = doc.meta.get_field(fieldname)
+		if df.fieldtype == "Read Only" or df.read_only:
+			frappe.throw(_("Can not edit Read Only fields"))
+		else:
+			doc.set(fieldname, value)
 
 	doc.save()
 
diff --git a/frappe/templates/includes/breadcrumbs.html b/frappe/templates/includes/breadcrumbs.html
index 01e1162ac6..3303f44677 100644
--- a/frappe/templates/includes/breadcrumbs.html
+++ b/frappe/templates/includes/breadcrumbs.html
@@ -1,4 +1,4 @@
-{% set parents = doc.get_parents() if doc else [] %}
+{% set parents = doc.get_parents() if (doc and hasattr(doc, "get_parents")) else [] %}
 <ul class="breadcrumb">
 	{% if parents|length > 0 %}
 		{% for parent in parents %}