diff --git a/src/Passingwind.Abp.ElsaModule.Application.Contracts/Teams/WorkflowTeamRoleScopeDto.cs b/src/Passingwind.Abp.ElsaModule.Application.Contracts/Teams/WorkflowTeamRoleScopeDto.cs
index 10a9326..d432597 100644
--- a/src/Passingwind.Abp.ElsaModule.Application.Contracts/Teams/WorkflowTeamRoleScopeDto.cs
+++ b/src/Passingwind.Abp.ElsaModule.Application.Contracts/Teams/WorkflowTeamRoleScopeDto.cs
@@ -7,5 +7,5 @@ public class WorkflowTeamRoleScopeDto : EntityDto
 {
     public string RoleName { get; set; }
 
-    public List<WorkflowTeamRoleScopeValueDto> Values { get; }
+    public List<WorkflowTeamRoleScopeValueDto> Values { get; set; } = new List<WorkflowTeamRoleScopeValueDto>();
 }
diff --git a/src/Passingwind.Abp.ElsaModule.Application/Teams/WorkflowTeamAppService.cs b/src/Passingwind.Abp.ElsaModule.Application/Teams/WorkflowTeamAppService.cs
index 1604f36..2c26730 100644
--- a/src/Passingwind.Abp.ElsaModule.Application/Teams/WorkflowTeamAppService.cs
+++ b/src/Passingwind.Abp.ElsaModule.Application/Teams/WorkflowTeamAppService.cs
@@ -119,7 +119,9 @@ public async Task<ListResultDto<WorkflowTeamRoleScopeDto>> GetRoleScopesAsync(Gu
     {
         var entity = await _workflowTeamRepository.GetAsync(id);
 
-        return new ListResultDto<WorkflowTeamRoleScopeDto>(ObjectMapper.Map<List<WorkflowTeamRoleScope>, List<WorkflowTeamRoleScopeDto>>(entity.RoleScopes));
+        var roleScopes = entity.RoleScopes ?? new List<WorkflowTeamRoleScope>();
+
+        return new ListResultDto<WorkflowTeamRoleScopeDto>(ObjectMapper.Map<List<WorkflowTeamRoleScope>, List<WorkflowTeamRoleScopeDto>>(roleScopes));
     }
 
     [Authorize(Policy = ElsaModulePermissions.WorkflowTeams.Update)]