commerce_discount.info.inc |  1 +
 commerce_discount.module   | 19 ++++++++++++++-----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/commerce_discount.info.inc b/commerce_discount.info.inc
index 26222eb..ac5d029 100644
--- a/commerce_discount.info.inc
+++ b/commerce_discount.info.inc
@@ -17,6 +17,7 @@ class CommerceDiscountMetadataController extends EntityDefaultMetadataController
     $properties['status']['type'] = 'boolean';
     $properties['component_title']['translatable'] = TRUE;
     $properties['component_title']['i18n string'] = TRUE;
+
     return $info;
   }
 }
diff --git a/commerce_discount.module b/commerce_discount.module
index 03772d7..5b4fac5 100644
--- a/commerce_discount.module
+++ b/commerce_discount.module
@@ -347,7 +347,9 @@ function commerce_discount_field_widget_form_alter(&$element, &$form_state, $con
  * Rebuild Rules configuration.
  */
 function commerce_discount_commerce_discount_insert($entity) {
-  i18n_string_object_update('commerce_discount', $entity);
+  if (module_exists('i18n_string')) {
+    i18n_string_object_update('commerce_discount', $entity);
+  }
   entity_defaults_rebuild(array('rules_config'));
 }
 
@@ -357,10 +359,15 @@ function commerce_discount_commerce_discount_insert($entity) {
  * Rebuild Rules configuration.
  */
 function commerce_discount_commerce_discount_update($entity) {
-  if ($entity->original->name != $entity->name) {
-    i18n_string_update_context("commerce_discount:commerce_discount:" . $entity->original->name . ":component_title", "commerce_discount:commerce_discount:" . $entity->name . ":component_title");
+  if (module_exists('i18n_string')) {
+    if ($entity->original->name != $entity->name) {
+      i18n_string_update_context(
+        "commerce_discount:commerce_discount:" . $entity->original->name . ":component_title",
+        "commerce_discount:commerce_discount:" . $entity->name . ":component_title"
+      );
+    }
+    i18n_string_object_update('commerce_discount', $entity);
   }
-  i18n_string_object_update('commerce_discount', $entity);
   entity_defaults_rebuild(array('rules_config'));
 }
 
@@ -370,7 +377,9 @@ function commerce_discount_commerce_discount_update($entity) {
  * Delete referenced commerce_discount_offer upon commerce_discount deletion.
  */
 function commerce_discount_commerce_discount_delete($entity) {
-  i18n_string_object_remove('commerce_discount', $entity);
+  if (module_exists('i18n_string')) {
+    i18n_string_object_remove('commerce_discount', $entity);
+  }
   $wrapper = entity_metadata_wrapper('commerce_discount', $entity);
   // Delete the referenced commerce_discount_offer.
   if ($wrapper->commerce_discount_offer->value()) {