diff --git a/swagger_parser/CHANGELOG.md b/swagger_parser/CHANGELOG.md
index 562be08b..e42d251e 100644
--- a/swagger_parser/CHANGELOG.md
+++ b/swagger_parser/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 1.10.4
+- Fix bug with `additionalProperties` ([#114](https://github.com/Carapacik/swagger_parser/issues/114))
+
 ## 1.10.3
 - Add new config parameter `original_http_response`(only for dart) ([#115](https://github.com/Carapacik/swagger_parser/issues/115))
 
diff --git a/swagger_parser/lib/src/parser/parser.dart b/swagger_parser/lib/src/parser/parser.dart
index 04c2fff1..441ea6d1 100644
--- a/swagger_parser/lib/src/parser/parser.dart
+++ b/swagger_parser/lib/src/parser/parser.dart
@@ -794,10 +794,11 @@ class OpenApiParser {
         (map.containsKey(_additionalPropertiesConst) &&
             (map[_additionalPropertiesConst] is Map<String, dynamic>) &&
             (map[_additionalPropertiesConst] as Map<String, dynamic>)
-                .isNotEmpty)) {
+                .isNotEmpty &&
+            !(map[_additionalPropertiesConst] as Map<String, dynamic>)
+                .containsKey(_refConst))) {
       // false positive result
-      // ignore: unnecessary_null_checks
-      final (newName!, description) = protectName(
+      final (newName, description) = protectName(
         name ?? additionalName,
         uniqueIfNull: true,
         description: map[_descriptionConst]?.toString(),
@@ -834,10 +835,10 @@ class OpenApiParser {
         );
       }
 
-      if (_objectClasses.where((oc) => oc.name == newName.toPascal).isEmpty) {
+      if (_objectClasses.where((oc) => oc.name == newName!.toPascal).isEmpty) {
         _objectClasses.add(
           UniversalComponentClass(
-            name: newName.toPascal,
+            name: newName!.toPascal,
             imports: typeWithImports
                 .where((e) => e.import != null)
                 .map((e) => e.import!)
@@ -849,7 +850,7 @@ class OpenApiParser {
 
       return (
         type: UniversalType(
-          type: newName.toPascal,
+          type: newName!.toPascal,
           name: newName.toCamel,
           description: description,
           format: map.containsKey(_formatConst)
@@ -935,16 +936,26 @@ class OpenApiParser {
     }
     // Type or ref
     else {
-      var type = map.containsKey(_typeConst)
-          ? map.containsKey(_refConst) &&
-                  map[_typeConst].toString() == _objectConst
-              ? _formatRef(map)
-              : map[_typeConst].toString()
-          : map.containsKey(_refConst)
-              ? _formatRef(map)
-              : _objectConst;
-
-      var import = map.containsKey(_refConst) ? _formatRef(map) : null;
+      String? import;
+      String type;
+
+      if (map.containsKey(_refConst)) {
+        import = _formatRef(map);
+      } else if (map.containsKey(_additionalPropertiesConst) &&
+          map[_additionalPropertiesConst] is Map<String, dynamic> &&
+          (map[_additionalPropertiesConst] as Map<String, dynamic>)
+              .containsKey(_refConst)) {
+        import =
+            _formatRef(map[_additionalPropertiesConst] as Map<String, dynamic>);
+      }
+
+      if (map.containsKey(_typeConst)) {
+        type = import != null && map[_typeConst].toString() == _objectConst
+            ? import
+            : map[_typeConst].toString();
+      } else {
+        type = import ?? _objectConst;
+      }
 
       if (import != null) {
         for (final replacementRule in _replacementRules) {
diff --git a/swagger_parser/pubspec.yaml b/swagger_parser/pubspec.yaml
index 93fa70d6..5a07a3e2 100644
--- a/swagger_parser/pubspec.yaml
+++ b/swagger_parser/pubspec.yaml
@@ -1,6 +1,6 @@
 name: swagger_parser
 description: Package that generates REST clients and data classes from OpenApi definition file
-version: 1.10.3
+version: 1.10.4
 repository: https://github.com/Carapacik/swagger_parser/tree/main/swagger_parser
 homepage: https://omega-r.com
 topics: