diff --git a/opennebula_api/serializers.py b/opennebula_api/serializers.py
index c7418aa5..3a77c0d8 100644
--- a/opennebula_api/serializers.py
+++ b/opennebula_api/serializers.py
@@ -46,7 +46,7 @@ class VirtualMachineSerializer(serializers.Serializer):
     """Serializer to map the virtual machine instance into JSON format."""
 
     name = serializers.SerializerMethodField()
-    cores = serializers.IntegerField(source='template.vcpu')
+    cores = serializers.SerializerMethodField()
     disk = serializers.IntegerField(write_only=True)
     set_memory = serializers.IntegerField(write_only=True, label='Memory')
     memory = serializers.SerializerMethodField()
@@ -99,6 +99,9 @@ class VirtualMachineSerializer(serializers.Serializer):
 
         return manager.get_vm(opennebula_id)
 
+    def get_cores(self, obj):
+        return int(float(obj.template.cpu) * 10)
+
     def get_memory(self, obj):
         return int(obj.template.memory) / 1024
 
@@ -127,19 +130,23 @@ class VirtualMachineSerializer(serializers.Serializer):
 
     def get_price(self, obj):
         template = obj.template
-        price = float(template.vcpu) * 5.0
+        price = float(template.cpu) * 10 * 5.0
         price += (int(template.memory) / 1024 * 2.0)
         for disk in template.disks:
             price += int(disk.size) / 1024 * 0.6
         return price
 
     def get_configuration(self, obj):
-        template_id = obj.template.template_id
-        template = OpenNebulaManager().get_template(template_id)
-        if template.name.startswith('public-'):
-            return template.name.lstrip('public-')
+        if hasattr(obj, 'template'):
+            if hasattr(obj, 'template.template_id'):
+                template_id = obj.template.template_id
+                template = OpenNebulaManager().get_template(template_id)
+                if template.name.startswith('public-'):
+                    return template.name.lstrip('public-')
+                else:
+                    return template.name
         else:
-            return template.name
+            return ""
 
     def get_ipv4(self, obj):
         """
diff --git a/utils/hosting_utils.py b/utils/hosting_utils.py
index ec97a320..ee65fccf 100644
--- a/utils/hosting_utils.py
+++ b/utils/hosting_utils.py
@@ -47,7 +47,8 @@ def get_or_create_vm_detail(user, manager, vm_id):
         vm_detail_obj = VMDetail.objects.create(
             user=user, vm_id=vm_id, disk_size=vm['disk_size'],
             cores=vm['cores'], memory=vm['memory'],
-            configuration=vm['configuration'], ipv4=vm['ipv4'],
+            configuration="" if vm['configuration'] is None else vm['configuration'],
+            ipv4=vm['ipv4'],
             ipv6=vm['ipv6']
         )
     return vm_detail_obj