diff --git a/src/handler/events/interactionCreate.ts b/src/handler/events/interactionCreate.ts
index 62193c0..70a778f 100644
--- a/src/handler/events/interactionCreate.ts
+++ b/src/handler/events/interactionCreate.ts
@@ -1,5 +1,5 @@
 import type { Awaitable, ChatInputCommandInteraction, Interaction } from "discord.js";
-import { map, filter, fromEvent,  Observable, of, mergeMap, tap} from "rxjs";
+import { map, filter, fromEvent,  Observable, of, mergeMap, tap, concatMap} from "rxjs";
 import { None, Some } from "ts-results";
 import { CommandType } from "../sern";
 import Context from "../structures/context";
@@ -13,7 +13,7 @@ export const onInteractionCreate = ( wrapper : Wrapper ) => {
 
       (fromEvent(client, 'interactionCreate') as Observable<Interaction>)
       .pipe( 
-        mergeMap ( interaction => {
+        concatMap ( interaction => {
             if (interaction.isChatInputCommand()) {
                 return of(interaction.commandName).pipe(
                     map ( Files.Commands.get ),
diff --git a/src/handler/structures/errors.ts b/src/handler/structures/errors.ts
index 2b1a4db..92187e8 100644
--- a/src/handler/structures/errors.ts
+++ b/src/handler/structures/errors.ts
@@ -1,5 +1,6 @@
 export enum SernError {
     RESERVED_EVENT = 'Cannot register the reserved ready event. Please use the init property.',
     NO_ALIAS = 'You cannot provide an array with elements to a slash command.',
-    NOT_VALID_MOD_TYPE = 'Detected an unknown module type'
+    NOT_VALID_MOD_TYPE = 'Detected an unknown module type',
+    UNDEFINED_MODULE = `A module could not be detected at`
 }
diff --git a/src/handler/utilities/readFile.ts b/src/handler/utilities/readFile.ts
index 00d2e3f..bd874ff 100644
--- a/src/handler/utilities/readFile.ts
+++ b/src/handler/utilities/readFile.ts
@@ -3,6 +3,7 @@ import type { ApplicationCommandOptionData } from 'discord.js';
 import { readdirSync, statSync } from 'fs';
 import { join } from 'path';
 import type { Module } from '../structures/commands/module';
+import { SernError } from '../structures/errors';
 
 
 export const Commands = new Map<string, Module>();
@@ -39,7 +40,9 @@ export async function buildData(commandDir: string ): Promise<
 > {
   return Promise.all(
     getCommands(commandDir).map( async (absPath) => {
-      return {  mod: (await import(absPath)).module as Module, absPath };
+      const mod = (await import(absPath)).module as Module;
+      if (mod === undefined) throw Error(`${SernError.UNDEFINED_MODULE} ${absPath}`)
+      return {  mod, absPath };
     }),
   );
 }