diff --git a/app/features/calendar/loaders/calendar.$id.server.ts b/app/features/calendar/loaders/calendar.$id.server.ts
index dbde17528..aa7e50aca 100644
--- a/app/features/calendar/loaders/calendar.$id.server.ts
+++ b/app/features/calendar/loaders/calendar.$id.server.ts
@@ -1,18 +1,18 @@
 import type { LoaderFunctionArgs } from "@remix-run/node";
 import { redirect } from "@remix-run/node";
-import { z } from "zod";
 import * as CalendarRepository from "~/features/calendar/CalendarRepository.server";
-import { notFoundIfFalsy } from "~/utils/remix.server";
+import { notFoundIfFalsy, parseParams } from "~/utils/remix.server";
 import { tournamentPage } from "~/utils/urls";
-import { actualNumber, id } from "~/utils/zod";
+import { idObject } from "~/utils/zod";
 
-export const loader = async ({ params }: LoaderFunctionArgs) => {
-	const parsedParams = z
-		.object({ id: z.preprocess(actualNumber, id) })
-		.parse(params);
+export const loader = async (args: LoaderFunctionArgs) => {
+	const params = parseParams({
+		params: args.params,
+		schema: idObject,
+	});
 	const event = notFoundIfFalsy(
 		await CalendarRepository.findById({
-			id: parsedParams.id,
+			id: params.id,
 			includeBadgePrizes: true,
 			includeMapPool: true,
 		}),
@@ -24,6 +24,6 @@ export const loader = async ({ params }: LoaderFunctionArgs) => {
 
 	return {
 		event,
-		results: await CalendarRepository.findResultsByEventId(parsedParams.id),
+		results: await CalendarRepository.findResultsByEventId(params.id),
 	};
 };
diff --git a/app/features/top-search/loaders/xsearch.player.$id.server.ts b/app/features/top-search/loaders/xsearch.player.$id.server.ts
index 0460792a8..50897bc00 100644
--- a/app/features/top-search/loaders/xsearch.player.$id.server.ts
+++ b/app/features/top-search/loaders/xsearch.player.$id.server.ts
@@ -1,12 +1,16 @@
 import type { LoaderFunctionArgs } from "@remix-run/node";
 import { removeDuplicates } from "~/utils/arrays";
-import { notFoundIfFalsy } from "~/utils/remix.server";
+import { notFoundIfFalsy, parseParams } from "~/utils/remix.server";
+import { idObject } from "~/utils/zod";
 import { findPlacementsByPlayerId } from "../queries/findPlacements.server";
 
-export const loader = async ({ params }: LoaderFunctionArgs) => {
-	const placements = notFoundIfFalsy(
-		findPlacementsByPlayerId(Number(params.id)),
-	);
+export const loader = async (args: LoaderFunctionArgs) => {
+	const params = parseParams({
+		params: args.params,
+		schema: idObject,
+	});
+
+	const placements = notFoundIfFalsy(findPlacementsByPlayerId(params.id));
 
 	const primaryName = placements[0].name;
 	const aliases = removeDuplicates(
diff --git a/app/features/top-search/queries/findPlacements.server.ts b/app/features/top-search/queries/findPlacements.server.ts
index 97be32a03..ce5a4a25f 100644
--- a/app/features/top-search/queries/findPlacements.server.ts
+++ b/app/features/top-search/queries/findPlacements.server.ts
@@ -72,7 +72,7 @@ export function findPlacementsByPlayerId(
 	playerId: Tables["XRankPlacement"]["playerId"],
 ) {
 	const results = byPlayerStm.all({ playerId }) as Array<FindPlacement>;
-	if (!results) return null;
+	if (results.length === 0) return null;
 
 	return results;
 }
diff --git a/app/features/tournament-bracket/actions/to.$id.brackets.server.ts b/app/features/tournament-bracket/actions/to.$id.brackets.server.ts
index 400699259..c2df28de3 100644
--- a/app/features/tournament-bracket/actions/to.$id.brackets.server.ts
+++ b/app/features/tournament-bracket/actions/to.$id.brackets.server.ts
@@ -50,7 +50,7 @@ export const action: ActionFunction = async ({ params, request }) => {
 			invariant(bracket, "Bracket not found");
 
 			const seeding = bracket.seeding;
-			invariant(seeding, "Seeding not found");
+			errorToastIfFalsy(seeding, "Bracket already started");
 
 			errorToastIfFalsy(
 				bracket.canBeStarted,
diff --git a/app/features/tournament/actions/to.$id.admin.server.ts b/app/features/tournament/actions/to.$id.admin.server.ts
index a8d1da58a..e872282e1 100644
--- a/app/features/tournament/actions/to.$id.admin.server.ts
+++ b/app/features/tournament/actions/to.$id.admin.server.ts
@@ -208,6 +208,11 @@ export const action: ActionFunction = async ({ request, params }) => {
 
 			const previousTeam = tournament.teamMemberOfByUser({ id: data.userId });
 
+			errorToastIfFalsy(
+				!previousTeam?.id || previousTeam.id !== team.id,
+				"User is already in this team",
+			);
+
 			errorToastIfFalsy(
 				tournament.hasStarted || !previousTeam,
 				"User is already in a team",
diff --git a/app/utils/zod.ts b/app/utils/zod.ts
index 458a30246..729c4d37c 100644
--- a/app/utils/zod.ts
+++ b/app/utils/zod.ts
@@ -8,6 +8,9 @@ import type { Unpacked } from "./types";
 import { assertType } from "./types";
 
 export const id = z.coerce.number({ message: "Required" }).int().positive();
+export const idObject = z.object({
+	id,
+});
 export const optionalId = z.coerce.number().int().positive().optional();
 
 export const nonEmptyString = z.string().trim().min(1, {