diff --git a/apps/dokploy/__test__/backups/backup-command-null-guard.test.ts b/apps/dokploy/__test__/backups/backup-command-null-guard.test.ts
new file mode 100644
index 000000000..d761becce
--- /dev/null
+++ b/apps/dokploy/__test__/backups/backup-command-null-guard.test.ts
@@ -0,0 +1,320 @@
+import type { BackupSchedule } from "@dokploy/server/services/backup";
+import { getDatabaseType } from "@dokploy/server/utils/backups/compose";
+import {
+	generateBackupCommand,
+	getBackupCommand,
+} from "@dokploy/server/utils/backups/utils";
+import { describe, expect, it } from "vitest";
+
+// Minimal builder for `BackupSchedule` (the joined row returned by
+// `findBackupById`). The pure functions under test only read a handful of
+// fields (backupType, databaseType, metadata, database, serviceName, and the
+// relevant relation's appName / composeType); every other relation defaults to
+// null. The whole object is asserted into shape with a double cast so the tests
+// don't have to fabricate the full destination / relation graph.
+const makeBackup = (
+	over: Partial<BackupSchedule> &
+		Pick<BackupSchedule, "backupType" | "databaseType">,
+): BackupSchedule =>
+	({
+		backupId: "backup-1",
+		appName: "app-backup",
+		schedule: "0 * * * *",
+		enabled: true,
+		database: "db",
+		prefix: "prefix",
+		serviceName: "svc",
+		destinationId: "dest-1",
+		keepLatestCount: null,
+		includeEncryptionKey: true,
+		composeId: null,
+		postgresId: null,
+		mariadbId: null,
+		mysqlId: null,
+		mongoId: null,
+		libsqlId: null,
+		userId: null,
+		metadata: undefined,
+		postgres: null,
+		mysql: null,
+		mariadb: null,
+		mongo: null,
+		libsql: null,
+		compose: null,
+		...over,
+	}) as unknown as BackupSchedule;
+
+const makeCompose = (
+	over: Partial<NonNullable<BackupSchedule["compose"]>> = {},
+): NonNullable<BackupSchedule["compose"]> =>
+	({
+		composeId: "compose-1",
+		appName: "myapp",
+		composeType: "docker-compose",
+		...over,
+	}) as unknown as NonNullable<BackupSchedule["compose"]>;
+
+const RCLONE_FLAGS = ["--s3-access-key-id=k", "--s3-secret-access-key=s"];
+const RCLONE_DEST = ":s3:bucket/app_svc/prefix/file.sql.gz";
+const LOG_PATH = "/tmp/backup.log";
+
+describe("generateBackupCommand", () => {
+	describe("returns a dump command for supported configs", () => {
+		const valid: Array<[string, BackupSchedule]> = [
+			[
+				"database postgres",
+				makeBackup({
+					backupType: "database",
+					databaseType: "postgres",
+					postgres: { appName: "pg-app", databaseUser: "u" } as any,
+				}),
+			],
+			[
+				"database mysql",
+				makeBackup({
+					backupType: "database",
+					databaseType: "mysql",
+					mysql: { appName: "my-app", databaseRootPassword: "p" } as any,
+				}),
+			],
+			[
+				"database mariadb",
+				makeBackup({
+					backupType: "database",
+					databaseType: "mariadb",
+					mariadb: {
+						appName: "maria-app",
+						databaseUser: "u",
+						databasePassword: "p",
+					} as any,
+				}),
+			],
+			[
+				"database mongo",
+				makeBackup({
+					backupType: "database",
+					databaseType: "mongo",
+					mongo: {
+						appName: "mongo-app",
+						databaseUser: "u",
+						databasePassword: "p",
+					} as any,
+				}),
+			],
+			[
+				"database libsql",
+				makeBackup({
+					backupType: "database",
+					databaseType: "libsql",
+					libsql: { appName: "lib-app" } as any,
+				}),
+			],
+			[
+				"compose postgres with metadata.postgres",
+				makeBackup({
+					backupType: "compose",
+					databaseType: "postgres",
+					compose: makeCompose(),
+					metadata: { postgres: { databaseUser: "u" } },
+				}),
+			],
+			[
+				"compose mysql with metadata.mysql",
+				makeBackup({
+					backupType: "compose",
+					databaseType: "mysql",
+					compose: makeCompose(),
+					metadata: { mysql: { databaseRootPassword: "p" } },
+				}),
+			],
+			[
+				"compose mariadb with metadata.mariadb",
+				makeBackup({
+					backupType: "compose",
+					databaseType: "mariadb",
+					compose: makeCompose(),
+					metadata: {
+						mariadb: { databaseUser: "u", databasePassword: "p" },
+					},
+				}),
+			],
+			[
+				"compose mongo with metadata.mongo",
+				makeBackup({
+					backupType: "compose",
+					databaseType: "mongo",
+					compose: makeCompose(),
+					metadata: { mongo: { databaseUser: "u", databasePassword: "p" } },
+				}),
+			],
+		];
+		const expectedNeedle: Record<string, string> = {
+			postgres: "pg_dump",
+			mysql: "mysqldump",
+			mariadb: "mariadb-dump",
+			mongo: "mongodump",
+			libsql: "tar",
+		};
+
+		for (const [label, backup] of valid) {
+			it(label, () => {
+				const cmd = generateBackupCommand(backup);
+				expect(cmd).not.toBeNull();
+				expect(typeof cmd).toBe("string");
+				expect(cmd).toContain(expectedNeedle[backup.databaseType]);
+			});
+		}
+	});
+
+	describe("returns null for compose configs the server accepts but cannot dump", () => {
+		const unsupported: Array<[string, BackupSchedule["databaseType"]]> = [
+			["compose libsql (no compose branch exists at all)", "libsql"],
+			["compose postgres without metadata.postgres", "postgres"],
+			["compose mysql without metadata.mysql", "mysql"],
+			["compose mariadb without metadata.mariadb", "mariadb"],
+			["compose mongo without metadata.mongo", "mongo"],
+		];
+
+		for (const [label, databaseType] of unsupported) {
+			it(label, () => {
+				const cmd = generateBackupCommand(
+					makeBackup({
+						backupType: "compose",
+						databaseType,
+						compose: makeCompose(),
+						metadata: undefined,
+					}),
+				);
+				expect(cmd).toBeNull();
+			});
+		}
+	});
+
+	it("web-server throws a typed unsupported error (asymmetry reference)", () => {
+		expect(() =>
+			generateBackupCommand(
+				makeBackup({ backupType: "compose", databaseType: "web-server" }),
+			),
+		).toThrow(/Database type not supported: web-server/);
+	});
+});
+
+describe("getBackupCommand null guard", () => {
+	// Regression: previously `generateBackupCommand`'s `null` return was
+	// interpolated straight into the bash pipeline, producing the literal
+	// dump command `null` (`{ null | rclone rcat ...; }`), which fails on every
+	// run under `set -eo pipefail`. The guard must turn that into a typed error
+	// naming the unsupported combination instead of emitting a broken script.
+	const unsupported: Array<[string, BackupSchedule["databaseType"]]> = [
+		["compose libsql", "libsql"],
+		["compose postgres without metadata", "postgres"],
+		["compose mysql without metadata", "mysql"],
+		["compose mariadb without metadata", "mariadb"],
+		["compose mongo without metadata", "mongo"],
+	];
+
+	for (const [label, databaseType] of unsupported) {
+		const backup = makeBackup({
+			backupType: "compose",
+			databaseType,
+			compose: makeCompose(),
+			metadata: undefined,
+		});
+
+		it(`throws (does not build a 'null' pipeline) for ${label}`, () => {
+			expect(() =>
+				getBackupCommand(backup, RCLONE_FLAGS, RCLONE_DEST, LOG_PATH),
+			).toThrow();
+		});
+
+		it(`error names backupType and databaseType for ${label}`, () => {
+			expect(() =>
+				getBackupCommand(backup, RCLONE_FLAGS, RCLONE_DEST, LOG_PATH),
+			).toThrow(
+				new RegExp(
+					`Backup not supported for backupType=compose databaseType=${databaseType}`,
+				),
+			);
+		});
+	}
+
+	it("never emits a pipeline whose dump side is the literal token `null`", () => {
+		const backup = makeBackup({
+			backupType: "compose",
+			databaseType: "libsql",
+			compose: makeCompose(),
+		});
+		let produced: string | undefined;
+		try {
+			produced = getBackupCommand(
+				backup,
+				RCLONE_FLAGS,
+				RCLONE_DEST,
+				LOG_PATH,
+			) as string;
+		} catch {
+			// expected: the guard throws before any interpolation
+		}
+		// If the guard were ever bypassed and a script was returned, the dump
+		// side of the pipe must never be the bare literal `null`.
+		if (typeof produced === "string") {
+			expect(produced).not.toContain("{ null |");
+		}
+	});
+
+	it("builds a real pipeline for a supported compose config", () => {
+		const backup = makeBackup({
+			backupType: "compose",
+			databaseType: "postgres",
+			compose: makeCompose(),
+			metadata: { postgres: { databaseUser: "u" } },
+		});
+		const script = getBackupCommand(
+			backup,
+			RCLONE_FLAGS,
+			RCLONE_DEST,
+			LOG_PATH,
+		);
+		expect(script).toContain("rclone rcat");
+		expect(script).toContain("pg_dump");
+		expect(script).not.toContain("{ null |");
+	});
+
+	it("builds a real pipeline for a supported database config", () => {
+		const backup = makeBackup({
+			backupType: "database",
+			databaseType: "postgres",
+			postgres: { appName: "pg-app", databaseUser: "u" } as any,
+		});
+		const script = getBackupCommand(
+			backup,
+			RCLONE_FLAGS,
+			RCLONE_DEST,
+			LOG_PATH,
+		);
+		expect(script).toContain("rclone rcat");
+		expect(script).toContain("pg_dump");
+		expect(script).not.toContain("{ null |");
+	});
+});
+
+describe("getDatabaseType notification labeling", () => {
+	// The compose backup error/success notification builds its `databaseType`
+	// label from this map. libsql was previously mislabeled as "mongodb".
+	const cases: Array<[BackupSchedule["databaseType"], string]> = [
+		["mongo", "mongodb"],
+		["postgres", "postgres"],
+		["mariadb", "mariadb"],
+		["mysql", "mysql"],
+		["libsql", "libsql"],
+	];
+	for (const [input, expected] of cases) {
+		it(`labels ${input} as ${expected}`, () => {
+			expect(getDatabaseType(input)).toBe(expected);
+		});
+	}
+
+	it("labels libsql correctly (regression: was 'mongodb')", () => {
+		expect(getDatabaseType("libsql")).not.toBe("mongodb");
+	});
+});
diff --git a/packages/server/src/utils/backups/compose.ts b/packages/server/src/utils/backups/compose.ts
index 7a5ba5535..756089d22 100644
--- a/packages/server/src/utils/backups/compose.ts
+++ b/packages/server/src/utils/backups/compose.ts
@@ -68,7 +68,7 @@ export const runComposeBackup = async (
 			projectName: project.name,
 			databaseType: getDatabaseType(databaseType),
 			type: "error",
-			// @ts-ignore
+			// @ts-expect-error
 			errorMessage: error?.message || "Error message not provided",
 			organizationId: project.organizationId,
 			databaseName: backup.database,
@@ -79,7 +79,9 @@ export const runComposeBackup = async (
 	}
 };
 
-const getDatabaseType = (databaseType: BackupSchedule["databaseType"]) => {
+export const getDatabaseType = (
+	databaseType: BackupSchedule["databaseType"],
+) => {
 	if (databaseType === "mongo") {
 		return "mongodb";
 	}
@@ -92,5 +94,8 @@ const getDatabaseType = (databaseType: BackupSchedule["databaseType"]) => {
 	if (databaseType === "mysql") {
 		return "mysql";
 	}
+	if (databaseType === "libsql") {
+		return "libsql";
+	}
 	return "mongodb";
 };
diff --git a/packages/server/src/utils/backups/utils.ts b/packages/server/src/utils/backups/utils.ts
index 4253a3876..69787d109 100644
--- a/packages/server/src/utils/backups/utils.ts
+++ b/packages/server/src/utils/backups/utils.ts
@@ -265,6 +265,11 @@ export const getBackupCommand = (
 ) => {
 	const containerSearch = getContainerSearchCommand(backup);
 	const backupCommand = generateBackupCommand(backup);
+	if (backupCommand === null) {
+		throw new Error(
+			`Backup not supported for backupType=${backup.backupType} databaseType=${backup.databaseType}`,
+		);
+	}
 	const rcloneCommand = `rclone rcat ${rcloneFlags.join(" ")} "${rcloneDestination}"`;
 	const rcloneDeleteCommand = `rclone deletefile ${rcloneFlags.join(" ")} "${rcloneDestination}"`;