if_not_null_sort_array_inlineentityformcomplex.php.patch

diff --git a/src/Plugin/Field/FieldWidget/InlineEntityFormComplex.php b/src/Plugin/Field/FieldWidget/InlineEntityFormComplex.php
index 0859058..7dbd166 100644
--- a/src/Plugin/Field/FieldWidget/InlineEntityFormComplex.php
+++ b/src/Plugin/Field/FieldWidget/InlineEntityFormComplex.php
@@ -574,12 +574,14 @@ class InlineEntityFormComplex extends InlineEntityFormBase implements ContainerF
       }
     }
     // Sort values by weight.
-    uasort($values, '\Drupal\Component\Utility\SortArray::sortByWeightElement');
-    // Let the widget massage the submitted values.
-    $values = $this->massageFormValues($values, $form, $form_state);
-    // Assign the values and remove the empty ones.
-    $items->setValue($values);
-    $items->filterEmptyItems();
+    if (!is_null($values)) {
+      uasort($values, '\Drupal\Component\Utility\SortArray::sortByWeightElement');
+      // Let the widget massage the submitted values.
+      $values = $this->massageFormValues($values, $form, $form_state);
+      // Assign the values and remove the empty ones.
+      $items->setValue($values);
+      $items->filterEmptyItems();
+    }
   }
 
   /**