diff --git a/src/lib/mongo/mongodb.ts b/src/lib/mongo/mongodb.ts
index acd4108a..07f4a282 100644
--- a/src/lib/mongo/mongodb.ts
+++ b/src/lib/mongo/mongodb.ts
@@ -3,17 +3,14 @@ import { MongoClient } from 'mongodb';
 import 'dotenv/config';
 
 const MONGODB_URI = process.env.MONGODB_URI;
-if (!MONGODB_URI) {
-	throw new Error('Invalid/Missing environment variable: "MONGODB_URI"');
-}
 
 const uri = MONGODB_URI;
 const options = {};
 
 let client;
-let clientPromise: Promise<MongoClient>;
+let clientPromise: Promise<MongoClient> | undefined;
 
-if (process.env.NODE_ENV === 'development') {
+if (process.env.NODE_ENV === 'development' && uri) {
 	/*
 	 * In development mode, use a global variable so that the value
 	 * Is preserved across module reloads caused by HMR (Hot Module Replacement).
@@ -23,7 +20,7 @@ if (process.env.NODE_ENV === 'development') {
 		global._mongoClientPromise = client.connect();
 	}
 	clientPromise = global._mongoClientPromise;
-} else {
+} else if (uri) {
 	// In production mode, it's best to not use a global variable.
 	client = new MongoClient(uri, options);
 	clientPromise = client.connect();
diff --git a/src/lib/trpc/routes/users.ts b/src/lib/trpc/routes/users.ts
index b20572e7..d398bd46 100644
--- a/src/lib/trpc/routes/users.ts
+++ b/src/lib/trpc/routes/users.ts
@@ -36,6 +36,10 @@ async function getPrismaAndMongoUser(userId: string) {
 		throw new TRPCError({ message: 'Migration has already been performed', code: 'CONFLICT' });
 	}
 
+	if (!clientPromise) {
+		throw new TRPCError({ message: "Couldn't connect V2's Mongo database", code: 'INTERNAL_SERVER_ERROR' });
+	}
+
 	const client = await clientPromise;
 	const mongoUser = await client.db().collection('users').findOne({ email: prismaUser?.email });
 	if (!mongoUser) {
@@ -91,6 +95,9 @@ export const users = t.router({
 	checkV2MigrationAvailability: t.procedure.query(async ({ ctx }) => {
 		try {
 			const { mongoUser } = await getPrismaAndMongoUser(ctx.userId);
+			if (!clientPromise) {
+				throw new TRPCError({ message: "Couldn't connect V2's Mongo database", code: 'INTERNAL_SERVER_ERROR' });
+			}
 			const client = await clientPromise;
 
 			const mesocycleTemplatesCount = await client
@@ -121,6 +128,9 @@ export const users = t.router({
 		.input(z.strictObject({ bodyweight: z.number(), duration: z.number() }))
 		.mutation(async ({ ctx, input }) => {
 			const { mongoUser } = await getPrismaAndMongoUser(ctx.userId);
+			if (!clientPromise) {
+				throw new TRPCError({ message: "Couldn't connect V2's Mongo database", code: 'INTERNAL_SERVER_ERROR' });
+			}
 
 			const client = await clientPromise;
 			const mesocycleTemplates = await client