diff --git a/src/routes/shadowBanUser.ts b/src/routes/shadowBanUser.ts
index 3ecb653..bd04760 100644
--- a/src/routes/shadowBanUser.ts
+++ b/src/routes/shadowBanUser.ts
@@ -48,16 +48,7 @@ export async function shadowBanUser(req: Request, res: Response): Promise<Respon
 
             //find all previous submissions and hide them
             if (unHideOldSubmissions) {
-                await db.prepare("run", `UPDATE "sponsorTimes" SET "shadowHidden" = 1 WHERE "userID" = ? AND "category" in (${categories.map((c) => `'${c}'`).join(",")})
-                                AND NOT EXISTS ( SELECT "videoID", "category" FROM "lockCategories" WHERE
-                                "sponsorTimes"."videoID" = "lockCategories"."videoID" AND "sponsorTimes"."category" = "lockCategories"."category")`, [userID]);
-
-                // clear cache for all old videos
-                (await db.prepare("all", `SELECT "videoID", "hashedVideoID", "service", "votes", "views" FROM "sponsorTimes" WHERE "userID" = ?`, [userID]))
-                    .forEach((videoInfo: {category: Category, videoID: VideoID, hashedVideoID: VideoIDHash, service: Service, userID: UserID}) => {
-                        QueryCacher.clearVideoCache(videoInfo);
-                    }
-                    );
+                await unHideSubmissions(categories, userID);
             }
         } else if (!enabled && row.userCount > 0) {
             //remove them from the shadow ban list
@@ -84,6 +75,16 @@ export async function shadowBanUser(req: Request, res: Response): Promise<Respon
                     return db.prepare("run", `UPDATE "sponsorTimes" SET "shadowHidden" = 0 WHERE "UUID" = ? AND "category" in (${categories.map((c) => `'${c}'`).join(",")})`, [UUID]);
                 }));
             }
+        // already shadowbanned
+        } else if (enabled && row.userCount > 0) {
+            // apply unHideOldSubmissions if applicable
+            if (unHideOldSubmissions) {
+                await unHideSubmissions(categories, userID);
+                return res.sendStatus(200);
+            }
+
+            // otherwise ban already exists, send 409
+            return res.sendStatus(409);
         }
     } else if (hashedIP) {
         //check to see if this user is already shadowbanned
@@ -115,3 +116,16 @@ export async function shadowBanUser(req: Request, res: Response): Promise<Respon
     }
     return res.sendStatus(200);
 }
+
+async function unHideSubmissions(categories: string[], userID: UserID) {
+    await db.prepare("run", `UPDATE "sponsorTimes" SET "shadowHidden" = 1 WHERE "userID" = ? AND "category" in (${categories.map((c) => `'${c}'`).join(",")})
+                    AND NOT EXISTS ( SELECT "videoID", "category" FROM "lockCategories" WHERE
+                    "sponsorTimes"."videoID" = "lockCategories"."videoID" AND "sponsorTimes"."category" = "lockCategories"."category")`, [userID]);
+
+    // clear cache for all old videos
+    (await db.prepare("all", `SELECT "videoID", "hashedVideoID", "service", "votes", "views" FROM "sponsorTimes" WHERE "userID" = ?`, [userID]))
+        .forEach((videoInfo: { category: Category; videoID: VideoID; hashedVideoID: VideoIDHash; service: Service; userID: UserID; }) => {
+            QueryCacher.clearVideoCache(videoInfo);
+        }
+    ); //eslint-disable-line
+}
\ No newline at end of file
diff --git a/test/cases/shadowBanUser.ts b/test/cases/shadowBanUser.ts
index 419c324..56cf15f 100644
--- a/test/cases/shadowBanUser.ts
+++ b/test/cases/shadowBanUser.ts
@@ -18,7 +18,11 @@ describe("shadowBanUser", () => {
         await db.prepare("run", insertQuery, ["testtesttest", 1, 11, 2, 0, "shadow-3-uuid-0", "shadowBanned3", 0, 50, "sponsor", "YouTube", 100, 0, 1, getHash("testtesttest", 1)]);
         await db.prepare("run", insertQuery, ["testtesttest2", 1, 11, 2, 0, "shadow-3-uuid-0-1", "shadowBanned3", 0, 50, "sponsor", "PeerTube", 120, 0, 1, getHash("testtesttest2", 1)]);
         await db.prepare("run", insertQuery, ["testtesttest", 20, 33, 2, 0, "shadow-3-uuid-2", "shadowBanned3", 0, 50, "intro", "YouTube", 101, 0, 1, getHash("testtesttest", 1)]);
+
+        await db.prepare("run", insertQuery, ["testtesttest", 21, 34, 2, 0, "shadow-4-uuid-1", "shadowBanned4", 0, 50, "sponsor", "YouTube", 101, 0, 0, getHash("testtesttest", 1)]);
+
         await db.prepare("run", `INSERT INTO "shadowBannedUsers" ("userID") VALUES(?)`, ["shadowBanned3"]);
+        await db.prepare("run", `INSERT INTO "shadowBannedUsers" ("userID") VALUES(?)`, ["shadowBanned4"]);
 
         await db.prepare("run", `INSERT INTO "vipUsers" ("userID") VALUES(?)`, [getHash("shadow-ban-vip")]);
     });
@@ -106,4 +110,38 @@ describe("shadowBanUser", () => {
             .catch(err => done(err));
     });
 
+    it("Should get 409 when re-shadowbanning user", (done: Done) => {
+        fetch(`${getbaseURL()
+        }/api/shadowBanUser?userID=shadowBanned4&adminUserID=shadow-ban-vip&enabled=true&categories=["sponsor"]&unHideOldSubmissions=false`, {
+            method: "POST"
+        })
+            .then(async res => {
+                assert.strictEqual(res.status, 409);
+                const videoRow = await db.prepare("all", `SELECT "shadowHidden", "category" FROM "sponsorTimes" WHERE "userID" = ? AND "shadowHidden" = ?`, ["shadowBanned4", 0]);
+                const shadowRow = await db.prepare("get", `SELECT * FROM "shadowBannedUsers" WHERE "userID" = ?`, ["shadowBanned4"]);
+                assert.ok(shadowRow); // ban still exists
+                assert.strictEqual(videoRow.length, 1); // videos should not be hidden
+                assert.strictEqual(videoRow[0].category, "sponsor");
+                done();
+            })
+            .catch(err => done(err));
+    });
+
+    it("Should be able to re-shadowban user to hide old submissions", (done: Done) => {
+        fetch(`${getbaseURL()
+        }/api/shadowBanUser?userID=shadowBanned4&adminUserID=shadow-ban-vip&enabled=true&categories=["sponsor"]&unHideOldSubmissions=true`, {
+            method: "POST"
+        })
+            .then(async res => {
+                assert.strictEqual(res.status, 200);
+                const videoRow = await db.prepare("all", `SELECT "shadowHidden", "category" FROM "sponsorTimes" WHERE "userID" = ? AND "shadowHidden" = ?`, ["shadowBanned4", 1]);
+                const shadowRow = await db.prepare("get", `SELECT * FROM "shadowBannedUsers" WHERE "userID" = ?`, ["shadowBanned4"]);
+                assert.ok(shadowRow); // ban still exists
+                assert.strictEqual(videoRow.length, 1); // videos should be hidden
+                assert.strictEqual(videoRow[0].category, "sponsor");
+                done();
+            })
+            .catch(err => done(err));
+    });
+
 });