diff --git a/CHANGELOG.md b/CHANGELOG.md
index 997e5a1c..d19aa644 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Fix text area fields size and alignment
 - Optimize container loading when there are a large number of entities
 - Adding a verification in refreshContainer function for obj value which can be an empty string instead of an array
+- Fix refreshContainer crash when a field is serialized both as a scalar and as an array
 
 ## [1.24.0] - 2026-04-16
 
diff --git a/hook.php b/hook.php
index d55222fd..cfae93d6 100644
--- a/hook.php
+++ b/hook.php
@@ -165,6 +165,12 @@ function plugin_fields_uninstall()
         'itemtype' => ['LIKE' , 'PluginFields%'],
     ]);
 
+    // clean plugin configuration
+    $config = new PluginConfig();
+    $config->deleteByCriteria([
+        'context' => ['plugin:fields'],
+    ]);
+
     return true;
 }
 
diff --git a/inc/field.class.php b/inc/field.class.php
index 44bf2cd8..7f47d65b 100644
--- a/inc/field.class.php
+++ b/inc/field.class.php
@@ -1013,6 +1013,8 @@ function(obj, item) {
                             var name = multiple_matches[1];
                             if (!(name in obj) || obj[name] == "") {
                                 obj[name] = [];
+                            } else if (!Array.isArray(obj[name])) {
+                                obj[name] = [obj[name]];
                             }
                             obj[name].push(item.value);
                         } else {