diff --git a/src/Base/Models/CustomField/MultiSelectField.php b/src/Base/Models/CustomField/MultiSelectField.php
index fea1e40..d37d356 100644
--- a/src/Base/Models/CustomField/MultiSelectField.php
+++ b/src/Base/Models/CustomField/MultiSelectField.php
@@ -59,7 +59,7 @@ public function setValues(Array $values)
         $values = array_unique(array_merge($this->getValues(), $values));
         $enums = [];
         foreach($values as $value) {
-            $enum = array_search($value, (array)$this->field->enums);
+            $enum = array_search($value, get_object_vars($this->field->enums));
             if ($enum === false) {
                 throw new \Exception('Invalid value: "'.$value.'" for cfield "'.$this->name.'" (enum not found)');
             }
@@ -86,6 +86,9 @@ public function setEnums(Array $enums)
         $enums = array_unique(array_merge($this->getEnums(), $enums));
         $new_values = [];
         foreach ($enums as $enum) {
+            if (!array_key_exists($enum, get_object_vars($this->field->enums))) {
+                throw new \Exception('Invalid enum: "'.$enum.'" for cfield "'.$this->name.'" (not found)');
+            }
             $new_values[$enum]= (object)[
                 'enum' => $enum,
                 'value' => $this->field->enums->{$enum}
diff --git a/src/Base/Models/CustomField/SelectField.php b/src/Base/Models/CustomField/SelectField.php
index 5ba7d7a..254376d 100644
--- a/src/Base/Models/CustomField/SelectField.php
+++ b/src/Base/Models/CustomField/SelectField.php
@@ -24,7 +24,7 @@ public function getEnum()
      */
     public function setValue($value)
     {
-        $enum = array_search($value, (array)$this->field->enums);
+        $enum = array_search($value, get_object_vars($this->field->enums));
         if ($enum === false) {
             throw new \Exception('Invalid value: "'.$value.'" for cfield "'.$this->name.'" (enum not found)');
         }
@@ -40,7 +40,7 @@ public function setValue($value)
      */
     public function setEnum($enum)
     {
-        if (!array_key_exists($enum, (array)$this->field->enums)) {
+        if (!array_key_exists($enum, get_object_vars($this->field->enums))) {
             throw new \Exception('Invalid enum: "'.$enum.'" for cfield "'.$this->name.'" (not found)');
         }
 		$this->values = [