diff --git a/Admin/Installer.php b/Admin/Installer.php
index b38dd53..e39c6c0 100755
--- a/Admin/Installer.php
+++ b/Admin/Installer.php
@@ -58,6 +58,10 @@ final class Installer extends InstallerAbstract
         }
 
         $attributes = \json_decode($fileContent, true);
+        if (!\is_array($attributes)) {
+            return;
+        }
+
         $attrTypes  = self::createUnitAttributeTypes($app, $attributes);
         $attrValues = self::createUnitAttributeValues($app, $attrTypes, $attributes);
     }
@@ -65,10 +69,10 @@ final class Installer extends InstallerAbstract
     /**
      * Install default attribute types
      *
-     * @param ApplicationAbstract                                                                                                                                                              $app        Application
-     * @param array<array{name:string, l11n?:array<string, string>, is_required?:bool, is_custom_allowed?:bool, validation_pattern?:string, value_type?:string, values?:array<string, mixed>}> $attributes Attribute definition
+     * @param ApplicationAbstract $app        Application
+     * @param array               $attributes Attribute definition
      *
-     * @return array<string, array>
+     * @return array
      *
      * @since 1.0.0
      */
@@ -131,11 +135,11 @@ final class Installer extends InstallerAbstract
     /**
      * Create default attribute values for types
      *
-     * @param ApplicationAbstract                                                                                                                                                              $app          Application
-     * @param array                                                                                                                                                                            $unitAttrType Attribute types
-     * @param array<array{name:string, l11n?:array<string, string>, is_required?:bool, is_custom_allowed?:bool, validation_pattern?:string, value_type?:string, values?:array<string, mixed>}> $attributes   Attribute definition
+     * @param ApplicationAbstract $app          Application
+     * @param array               $unitAttrType Attribute types
+     * @param array               $attributes   Attribute definition
      *
-     * @return array<string, array>
+     * @return array
      *
      * @since 1.0.0
      */