diff --git a/packages/go_router_builder/CHANGELOG.md b/packages/go_router_builder/CHANGELOG.md
index 6b864002673..b9c3781092f 100644
--- a/packages/go_router_builder/CHANGELOG.md
+++ b/packages/go_router_builder/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.8.2
+
+- Fixes an issue when enum params are not required
+
 ## 2.8.1
 
 - Fixes an issue when navigate to router with invalid params 
diff --git a/packages/go_router_builder/example/lib/all_types.g.dart b/packages/go_router_builder/example/lib/all_types.g.dart
index a30f03f62c6..581814d47c2 100644
--- a/packages/go_router_builder/example/lib/all_types.g.dart
+++ b/packages/go_router_builder/example/lib/all_types.g.dart
@@ -716,7 +716,7 @@ bool _$boolConverter(String value) {
 }
 
 extension<T extends Enum> on Map<T, String> {
-  T? _$fromName(String value) =>
+  T? _$fromName(String? value) =>
       entries.where((element) => element.value == value).firstOrNull?.key;
 }
 
diff --git a/packages/go_router_builder/example/lib/main.g.dart b/packages/go_router_builder/example/lib/main.g.dart
index e489f48ad7d..ab4cbdb3540 100644
--- a/packages/go_router_builder/example/lib/main.g.dart
+++ b/packages/go_router_builder/example/lib/main.g.dart
@@ -147,7 +147,7 @@ extension $FamilyCountRouteExtension on FamilyCountRoute {
 }
 
 extension<T extends Enum> on Map<T, String> {
-  T? _$fromName(String value) =>
+  T? _$fromName(String? value) =>
       entries.where((element) => element.value == value).firstOrNull?.key;
 }
 
diff --git a/packages/go_router_builder/example/lib/stateful_shell_route_initial_location_example.g.dart b/packages/go_router_builder/example/lib/stateful_shell_route_initial_location_example.g.dart
index 11aa3efae3c..f86f360772d 100644
--- a/packages/go_router_builder/example/lib/stateful_shell_route_initial_location_example.g.dart
+++ b/packages/go_router_builder/example/lib/stateful_shell_route_initial_location_example.g.dart
@@ -111,6 +111,6 @@ extension $OrdersRouteDataExtension on OrdersRouteData {
 }
 
 extension<T extends Enum> on Map<T, String> {
-  T? _$fromName(String value) =>
+  T? _$fromName(String? value) =>
       entries.where((element) => element.value == value).firstOrNull?.key;
 }
diff --git a/packages/go_router_builder/lib/src/route_config.dart b/packages/go_router_builder/lib/src/route_config.dart
index d272335db28..fe60df748c3 100644
--- a/packages/go_router_builder/lib/src/route_config.dart
+++ b/packages/go_router_builder/lib/src/route_config.dart
@@ -775,7 +775,7 @@ bool $boolConverterHelperName(String value) {
 
 const String _enumConverterHelper = '''
 extension<T extends Enum> on Map<T, String> {
-  T? $enumExtensionHelperName(String value) =>
+  T? $enumExtensionHelperName(String? value) =>
       entries.where((element) => element.value == value).firstOrNull?.key;
 }''';
 
diff --git a/packages/go_router_builder/lib/src/type_helpers.dart b/packages/go_router_builder/lib/src/type_helpers.dart
index 6a13c146930..e5a0756c346 100644
--- a/packages/go_router_builder/lib/src/type_helpers.dart
+++ b/packages/go_router_builder/lib/src/type_helpers.dart
@@ -115,11 +115,13 @@ String _stateValueAccess(ParameterElement element, Set<String> pathParameters) {
   }
 
   late String access;
+  final String suffix =
+      !element.type.isNullableType && !element.hasDefaultValue ? '!' : '';
   if (pathParameters.contains(element.name)) {
-    access =
-        'pathParameters[${escapeDartString(element.name)}]${element.isRequired ? '!' : ''}';
+    access = 'pathParameters[${escapeDartString(element.name)}]$suffix';
   } else {
-    access = 'uri.queryParameters[${escapeDartString(element.name.kebab)}]';
+    access =
+        'uri.queryParameters[${escapeDartString(element.name.kebab)}]$suffix';
   }
 
   return access;
diff --git a/packages/go_router_builder/pubspec.yaml b/packages/go_router_builder/pubspec.yaml
index 6ef52a5819b..14312ddf005 100644
--- a/packages/go_router_builder/pubspec.yaml
+++ b/packages/go_router_builder/pubspec.yaml
@@ -2,7 +2,7 @@ name: go_router_builder
 description: >-
   A builder that supports generated strongly-typed route helpers for
   package:go_router
-version: 2.8.1
+version: 2.8.2
 repository: https://github.com/flutter/packages/tree/main/packages/go_router_builder
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+go_router_builder%22
 
diff --git a/packages/go_router_builder/test_inputs/enum_parameter.dart.expect b/packages/go_router_builder/test_inputs/enum_parameter.dart.expect
index 97c63224b35..42d27809f85 100644
--- a/packages/go_router_builder/test_inputs/enum_parameter.dart.expect
+++ b/packages/go_router_builder/test_inputs/enum_parameter.dart.expect
@@ -29,6 +29,6 @@ const _$EnumTestEnumMap = {
 };
 
 extension<T extends Enum> on Map<T, String> {
-  T? _$fromName(String value) =>
+  T? _$fromName(String? value) =>
       entries.where((element) => element.value == value).firstOrNull?.key;
 }
diff --git a/packages/go_router_builder/test_inputs/iterable_with_enum.dart.expect b/packages/go_router_builder/test_inputs/iterable_with_enum.dart.expect
index 8d20676242f..88a9f97dc27 100644
--- a/packages/go_router_builder/test_inputs/iterable_with_enum.dart.expect
+++ b/packages/go_router_builder/test_inputs/iterable_with_enum.dart.expect
@@ -38,6 +38,6 @@ const _$EnumOnlyUsedInIterableEnumMap = {
 };
 
 extension<T extends Enum> on Map<T, String> {
-  T? _$fromName(String value) =>
+  T? _$fromName(String? value) =>
       entries.where((element) => element.value == value).firstOrNull?.key;
 }
diff --git a/packages/go_router_builder/test_inputs/required_query_parameter.dart.expect b/packages/go_router_builder/test_inputs/required_query_parameter.dart.expect
index 1b62bee0e52..aac229ed118 100644
--- a/packages/go_router_builder/test_inputs/required_query_parameter.dart.expect
+++ b/packages/go_router_builder/test_inputs/required_query_parameter.dart.expect
@@ -7,7 +7,7 @@ extension $NonNullableRequiredParamNotInPathExtension
     on NonNullableRequiredParamNotInPath {
   static NonNullableRequiredParamNotInPath _fromState(GoRouterState state) =>
       NonNullableRequiredParamNotInPath(
-        id: int.parse(state.uri.queryParameters['id'])!,
+        id: int.parse(state.uri.queryParameters['id']!)!,
       );
 
   String get location => GoRouteData.$location(