xtables-addons-dkms 3.9-1ubuntu0.2~20.04.1: xtables-addons kernel module failed to build

The bug appeared after turning on the PC.
-Ubuntu 20.04 lts

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: xtables-addons-dkms 3.9-1ubuntu0.2~20.04.1
ProcVersionSignature: Ubuntu 5.8.0-63.71~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-63-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
DKMSKernelVersion: 5.11.0-25-generic
Date: Sun Aug 8 23:12:00 2021
DuplicateSignature: dkms:xtables-addons-dkms:3.9-1ubuntu0.2~20.04.1:/var/lib/dkms/xtables-addons/3.9/build/extensions/pknock/xt_pknock.c:263:20: error: implicit declaration of function ‘get_seconds’ [-Werror=implicit-function-declaration]
InstallationDate: Installed on 2020-12-14 (237 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
PackageVersion: 3.9-1ubuntu0.2~20.04.1
Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.6
SourcePackage: xtables-addons
Title: xtables-addons-dkms 3.9-1ubuntu0.2~20.04.1: xtables-addons kernel module failed to build
UpgradeStatus: No upgrade log present (probably fresh install)