why UnitOfWorkManagger.Current is null sometimes in using DisableFilter method?

I use this scenario in RoleManager class:

public class RoleManager : AbpRoleManager<Role, User>
  {
      private readonly IUnitOfWorkManager _unitOfWorkManager;
      private readonly ICacheManager _cacheManager;
      private readonly IPermissionManager _permissionManager;
      private readonly RoleStore _roleStore;

      public RoleManager(
          RoleStore store,
          IEnumerable<IRoleValidator<Role>> roleValidators,
          ILookupNormalizer keyNormalizer,
          IdentityErrorDescriber errors,
          ILogger<AbpRoleManager<Role, User>> logger,
          IPermissionManager permissionManager,
          ICacheManager cacheManager,
          IUnitOfWorkManager unitOfWorkManager,
          IRoleManagementConfig roleManagementConfig)
          : base(
              store,
              roleValidators,
              keyNormalizer,
              errors,
              logger,
              permissionManager,
              cacheManager,
              unitOfWorkManager,
              roleManagementConfig
          )
      {
          _cacheManager = cacheManager;
          _unitOfWorkManager = unitOfWorkManager;
          _permissionManager = permissionManager;
          _roleStore = store;
      }
  	
   public override async Task<bool> IsGrantedAsync(int roleId, Permission permission)
      {
          var cacheItem = await GetRolePermissionCacheItemAsync(roleId);
          return cacheItem.GrantedPermissions.Contains(permission.Name);
      }

      private async Task<RolePermissionCacheItem> GetRolePermissionCacheItemAsync(int roleId)
      {
          //take exception in current in belove code
          using (_unitOfWorkManager.Current.DisableFilter(AbpDataFilters.MayHaveTenant))
          {
            
          }
      }
}

[acjh]

So this issue can be closed?

[acjh]

Because there is no unit of work.

You can make your method protected virtual and mark it as [UnitOfWork]:

[UnitOfWork]
protected virtual async Task<RolePermissionCacheItem> GetRolePermissionCacheItemAsync(int roleId)
{
    using (_unitOfWorkManager.Current.DisableFilter(AbpDataFilters.MayHaveTenant))
    {
        // ...
    }
}