diff --git a/Dockerfile b/Dockerfile
index 719089ba..59f2026c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -66,6 +66,7 @@ ENV DEBIAN_FRONTEND="noninteractive" \
     PIP_ROOT_USER_ACTION='ignore'
 
 COPY --from=tubesync-etc /etc/debconf.conf /etc/debconf.conf
+COPY --from=tubesync-etc /usr/share/perl5/Debconf/DbDriver/Copy.pm /usr/share/perl5/Debconf/DbDriver/Copy.pm
 COPY --from=tubesync-etc /usr/share/perl5/Debconf/DbDriver/PackageDir.pm /usr/share/perl5/Debconf/DbDriver/PackageDir.pm
 
 RUN --mount=type=cache,id=apt-lib-cache-${TARGETARCH},sharing=private,target=/var/lib/apt \
diff --git a/patches/docker/tubesync-base/Debconf-DbDriver-Copy.pm.diff b/patches/docker/tubesync-base/Debconf-DbDriver-Copy.pm.diff
new file mode 100644
index 00000000..bf3c6f29
--- /dev/null
+++ b/patches/docker/tubesync-base/Debconf-DbDriver-Copy.pm.diff
@@ -0,0 +1,14 @@
+--- /usr/share/perl5/Debconf/DbDriver/Copy.pm.orig	2025-03-10 12:07:15.000000000 +0000
++++ /usr/share/perl5/Debconf/DbDriver/Copy.pm	2026-09-13 02:07:03.178411588 +0000
+@@ -22,7 +22,10 @@
+ 		@owners=("unknown");
+ 	}
+ 	foreach my $owner (@owners) {
+-		my $template = Debconf::Template->get($src->getfield($item, 'template'));
++		my $template_name = $src->getfield($item, 'template');
++		my $template = (defined($template_name) && length($template_name))
++			? Debconf::Template->get($template_name)
++			: undef;
+ 		my $type="";
+ 		$type = $template->type if $template;
+ 		$dest->addowner($item, $owner, $type);