diff --git a/addons/account/invoice.py b/addons/account/invoice.py
index 8df0318bf22..f965b405545 100644
--- a/addons/account/invoice.py
+++ b/addons/account/invoice.py
@@ -326,16 +326,18 @@ class account_invoice(osv.osv):
 
     def fields_view_get(self, cr, uid, view_id=None, view_type=False, context=None, toolbar=False, submenu=False):
         journal_obj = self.pool.get('account.journal')
-        if context.get('active_model','') in ['res.partner']:
-            partner = self.pool.get(context['active_model']).read(cr,uid,context['active_ids'],['supplier','customer'])[0]
+        if context is None:
+            context = {}
+        if context.get('active_model', '') in ['res.partner'] and context.get('active_ids', False) and context['active_ids']:
+            partner = self.pool.get(context['active_model']).read(cr, uid, context['active_ids'], ['supplier','customer'])[0]
             if not view_type:
-                view_id = self.pool.get('ir.ui.view').search(cr,uid,[('name','=','account.invoice.tree')])[0]
+                view_id = self.pool.get('ir.ui.view').search(cr, uid, [('name', '=', 'account.invoice.tree')])[0]
                 view_type = 'tree'
             if view_type == 'form':
                 if partner['supplier'] and not partner['customer']:
-                    view_id = self.pool.get('ir.ui.view').search(cr,uid,[('name','=','account.invoice.supplier.form')])[0]
+                    view_id = self.pool.get('ir.ui.view').search(cr,uid,[('name', '=', 'account.invoice.supplier.form')])[0]
                 else:
-                    view_id = self.pool.get('ir.ui.view').search(cr,uid,[('name','=','account.invoice.form')])[0]
+                    view_id = self.pool.get('ir.ui.view').search(cr,uid,[('name', '=', 'account.invoice.form')])[0]
         res = super(account_invoice,self).fields_view_get(cr, uid, view_id=view_id, view_type=view_type, context=context, toolbar=toolbar, submenu=submenu)
         type = context.get('journal_type', 'sale')
         for field in res['fields']: