diff --git a/android/fastlane/metadata/android/de-DE/changelogs/4013.txt b/android/fastlane/metadata/android/de-DE/changelogs/4013.txt
new file mode 100644
index 0000000..66efa76
--- /dev/null
+++ b/android/fastlane/metadata/android/de-DE/changelogs/4013.txt
@@ -0,0 +1 @@
+- Beheben eines Fehlers durch welchen Dokumente nicht mehr bearbeitet werden konnten
\ No newline at end of file
diff --git a/android/fastlane/metadata/android/en-US/changelogs/4013.txt b/android/fastlane/metadata/android/en-US/changelogs/4013.txt
new file mode 100644
index 0000000..e359420
--- /dev/null
+++ b/android/fastlane/metadata/android/en-US/changelogs/4013.txt
@@ -0,0 +1 @@
+- Fixed a bug which caused documents not being editable anymore
\ No newline at end of file
diff --git a/lib/features/changelogs/view/changelog_dialog.dart b/lib/features/changelogs/view/changelog_dialog.dart
index c3869a1..ccf6a0b 100644
--- a/lib/features/changelogs/view/changelog_dialog.dart
+++ b/lib/features/changelogs/view/changelog_dialog.dart
@@ -63,6 +63,7 @@ class ChangelogDialog extends StatelessWidget {
 }
 
 const _versionNumbers = {
+  "4013": "3.1.6",
   "4003": "3.1.5",
   "58": "3.1.4",
   "57": "3.1.3",
diff --git a/packages/paperless_api/lib/src/models/document_model.dart b/packages/paperless_api/lib/src/models/document_model.dart
index 3c605ee..335d280 100644
--- a/packages/paperless_api/lib/src/models/document_model.dart
+++ b/packages/paperless_api/lib/src/models/document_model.dart
@@ -51,7 +51,7 @@ class DocumentModel extends Equatable {
 
   // Only present if full_perms=true
   final Permissions? permissions;
-  final Iterable<CustomFieldModel>? customFields;
+  final Iterable<CustomFieldModel> customFields;
 
   const DocumentModel({
     required this.id,
@@ -71,7 +71,7 @@ class DocumentModel extends Equatable {
     this.owner,
     this.userCanChange,
     this.permissions,
-    this.customFields,
+    this.customFields = const [],
   });
 
   factory DocumentModel.fromJson(Map<String, dynamic> json) =>
diff --git a/packages/paperless_api/lib/src/models/permissions/permissions.dart b/packages/paperless_api/lib/src/models/permissions/permissions.dart
index 3530f8b..1995baf 100644
--- a/packages/paperless_api/lib/src/models/permissions/permissions.dart
+++ b/packages/paperless_api/lib/src/models/permissions/permissions.dart
@@ -14,5 +14,6 @@ class Permissions with _$Permissions {
     @HiveField(1) required UsersAndGroupsPermissions change,
   }) = _Permissions;
 
-  factory Permissions.fromJson(Map<String, dynamic> json) => _$PermissionsFromJson(json);
+  factory Permissions.fromJson(Map<String, dynamic> json) =>
+      _$PermissionsFromJson(json);
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index 1167070..f4daced 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -15,7 +15,7 @@ publish_to: "none" # Remove this line if you wish to publish to pub.dev
 # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
 # Read more about iOS versioning at
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
-version: 3.1.5+400
+version: 3.1.6+401
 
 environment:
   sdk: ">=3.1.0 <4.0.0"