diff --git a/src/env.ts b/src/env.ts
index abe7488..5804ec0 100644
--- a/src/env.ts
+++ b/src/env.ts
@@ -5,15 +5,22 @@ const clientSchema = z.object({
 	VITE_MATOMO_URL: z.url("Invalid URL format"),
 	VITE_MATOMO_SITE_ID: z.string("Invalid Site ID"),
 	VITE_MAINTENANCE_MODE: z
-		.enum(["true", "false"], 'Invalid Maintenance Mode (must be "true" or "false")')
+		.enum(
+			["true", "false"],
+			'Invalid Maintenance Mode (must be "true" or "false")',
+		)
 		.transform((v) => v === "true"),
 	VITE_MAINTENANCE_MODE_MESSAGE: z.string().optional(),
 });
 
 const serverSchema = z.object({
-	DISCORD_CONTACT_WEBHOOK: z.string("Invalid Discord Contact Webhook URL"),
-	DISCORD_ERROR_LOG_WEBHOOK: z.string("Invalid Discord Error Log Webhook URL"),
-	LICHESS_CLIENT_ID: z.string("Invalid Lichess Client ID"),
+	DISCORD_CONTACT_WEBHOOK: z
+		.string("Invalid Discord Contact Webhook URL")
+		.optional(),
+	DISCORD_ERROR_LOG_WEBHOOK: z
+		.string("Invalid Discord Error Log Webhook URL")
+		.optional(),
+	LICHESS_CLIENT_ID: z.string("Invalid Lichess Client ID").optional(),
 });
 
 const fullSchema = z.object({
diff --git a/src/server/contact.ts b/src/server/contact.ts
index 846b182..ba2b0cc 100644
--- a/src/server/contact.ts
+++ b/src/server/contact.ts
@@ -7,6 +7,10 @@ export const sendToDiscord = createServerFn({ method: "POST" })
 			data,
 	)
 	.handler(async ({ data }) => {
+		if (!env.DISCORD_CONTACT_WEBHOOK) {
+			return { ok: false, error: "Contact form is not configured" };
+		}
+
 		const response = await fetch(env.DISCORD_CONTACT_WEBHOOK, {
 			method: "POST",
 			headers: {
diff --git a/src/server/lichess.ts b/src/server/lichess.ts
index 9a2fe83..dfed3f4 100644
--- a/src/server/lichess.ts
+++ b/src/server/lichess.ts
@@ -18,10 +18,14 @@ import {
 const createVerifier = () => base64UrlEncode(randomBytes(32));
 const createChallenge = (verifier: string) => base64UrlEncode(sha256(verifier));
 
-const getRedirectUri = () =>
-	process.env.NODE_ENV === "production"
+const getRedirectUri = () => {
+	if (process.env.NODE_ENV === "production" && !env.LICHESS_CLIENT_ID) {
+		throw new Error("LICHESS_CLIENT_ID is not configured");
+	}
+	return process.env.NODE_ENV === "production"
 		? `https://${env.LICHESS_CLIENT_ID}/callback`
 		: "http://localhost:3000/callback";
+};
 
 export const getSession = createServerFn({ method: "GET" }).handler(
 	async () => {
diff --git a/vite.config.ts b/vite.config.ts
index b22511f..989cc24 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -18,6 +18,7 @@ const config = defineConfig({
 			prerender: {
 				enabled: true,
 				crawlLinks: true,
+				failOnError: true,
 			},
 			pages: [
 				{