diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6076b750..076a6f2d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ 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/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 {