diff --git a/models/product/product.hcl b/models/product/product.hcl
index 2bea09f..b61e9d4 100644
--- a/models/product/product.hcl
+++ b/models/product/product.hcl
@@ -1,17 +1,17 @@
 locals {
   product = basename(get_terragrunt_dir())
   catalog_name = values.catalog_name
-  mono_cpu          = values.mono_cpu
-  mono_memory       = values.mono_memory
-  mono_image        = values.mono_image
-  mono_service      = values.mono_service
-  mono_securityTag  = values.mono_securityTag
-  mono_instServices = values.mono_instServices
-  mono_ansibleJob   = values.mono_ansibleJob
-  mono_ansibleVars  = values.mono_ansibleVars
-  mono_disks        = values.mono_disks
-  mono_instances    = values.mono_instances
-  mono_startOrder   = values.mono_startOrder
+  mono_cpu          = try(values.mono_cpu)
+  mono_memory       = try(values.mono_memory)
+  mono_image        = try(values.mono_image)
+  mono_service      = try(values.mono_service)
+  mono_securityTag  = try(values.mono_securityTag)
+  mono_instServices = try(values.mono_instServices)
+  mono_ansibleJob   = try(values.mono_ansibleJob)
+  mono_ansibleVars  = try(values.mono_ansibleVars)
+  mono_disks        = try(values.mono_disks)
+  mono_instances    = try(values.mono_instances)
+  mono_startOrder   = try(values.mono_startOrder)
 
 }