diff -u b/conditional_fields.api.inc b/conditional_fields.api.inc
--- b/conditional_fields.api.inc
+++ b/conditional_fields.api.inc
@@ -310,7 +310,7 @@
           $return = TRUE;
           $key_exists = NULL;
           $input_state = NestedArray::getValue($form_state->getValues(), $dependent['field_parents'], $key_exists);
-          if ($key_exists && !is_object($input_state) && isset($input_state['add_more'])) {
+          if ($key_exists && isset($input_state['add_more'])) {
             // Remove the 'value' of the 'add more' button.
             unset($input_state['add_more']);
           }
@@ -332,7 +332,7 @@
           $key_exists = NULL;
           $values = $form_state->getValues();
           $input_state = NestedArray::getValue($values, $dependent['field_parents'], $key_exists);
-          if ($key_exists && isset($input_state['add_more'])) {
+          if ($key_exists && !is_object($input_state) && isset($input_state['add_more'])) {
             // Remove the 'value' of the 'add more' button.
             unset($input_state['add_more']);
           }