diff --git a/src/scripts/classes/errors.ts b/src/scripts/classes/errors.ts
index 5fcd304..aa967d0 100644
--- a/src/scripts/classes/errors.ts
+++ b/src/scripts/classes/errors.ts
@@ -21,6 +21,9 @@ interface IBaseError {
 }
 
 export const USER_NOT_LOGGED = "User not authenticated, unable to continue";
+export const INVALID_USER_ID = "Invalid user ID";
+export const INVALID_POST_ID = "Invalid post ID";
+export const INVALID_THREAD_ID = "Invalid thread ID";
 
 export class GenericAxiosError extends Error implements IBaseError {
   id: number;
@@ -52,4 +55,6 @@ export class InvalidF95Token extends Error {}
 
 export class UserNotLogged extends Error {}
 
+export class InvalidID extends Error {}
+
 export class ParameterError extends Error {}
diff --git a/src/scripts/classes/mapping/platform-user.ts b/src/scripts/classes/mapping/platform-user.ts
index b6ebd90..3e2d127 100644
--- a/src/scripts/classes/mapping/platform-user.ts
+++ b/src/scripts/classes/mapping/platform-user.ts
@@ -14,7 +14,7 @@ import { urls } from "../../constants/url";
 import { fetchHTML } from "../../network-helper";
 import { GENERIC, MEMBER } from "../../constants/css-selector";
 import shared from "../../shared";
-import { UserNotLogged, USER_NOT_LOGGED } from "../errors";
+import { InvalidID, INVALID_USER_ID, UserNotLogged, USER_NOT_LOGGED } from "../errors";
 import { ILazy } from "../../interfaces";
 
 /**
@@ -151,7 +151,7 @@ export default class PlatformUser implements ILazy {
     if (!shared.isLogged) throw new UserNotLogged(USER_NOT_LOGGED);
 
     // Check ID
-    if (!this.id && this.id < 1) throw new Error("Invalid user ID");
+    if (!this.id && this.id < 1) throw new InvalidID(INVALID_USER_ID);
 
     // Prepare the URL
     const url = new URL(this.id.toString(), `${urls.MEMBERS}/`).toString();
diff --git a/src/scripts/classes/mapping/post.ts b/src/scripts/classes/mapping/post.ts
index c8f9da5..57b992b 100644
--- a/src/scripts/classes/mapping/post.ts
+++ b/src/scripts/classes/mapping/post.ts
@@ -15,7 +15,7 @@ import { POST, THREAD } from "../../constants/css-selector";
 import { urls } from "../../constants/url";
 import { fetchHTML } from "../../network-helper";
 import shared from "../../shared";
-import { UserNotLogged, USER_NOT_LOGGED } from "../errors";
+import { InvalidID, INVALID_POST_ID, UserNotLogged, USER_NOT_LOGGED } from "../errors";
 import { ILazy } from "../../interfaces";
 
 /**
@@ -102,7 +102,7 @@ export default class Post implements ILazy {
     if (!shared.isLogged) throw new UserNotLogged(USER_NOT_LOGGED);
 
     // Check ID
-    if (!this.id && this.id < 1) throw new Error("Invalid post ID");
+    if (!this.id && this.id < 1) throw new InvalidID(INVALID_POST_ID);
 
     // Fetch HTML page containing the post
     const url = new URL(this.id.toString(), urls.POSTS).toString();
diff --git a/src/scripts/classes/mapping/thread.ts b/src/scripts/classes/mapping/thread.ts
index e061a1f..f391896 100644
--- a/src/scripts/classes/mapping/thread.ts
+++ b/src/scripts/classes/mapping/thread.ts
@@ -17,7 +17,7 @@ import { urls } from "../../constants/url";
 import { POST, THREAD } from "../../constants/css-selector";
 import { fetchHTML, fetchPOSTResponse } from "../../network-helper";
 import Shared from "../../shared";
-import { ParameterError, UserNotLogged, USER_NOT_LOGGED } from "../errors";
+import { InvalidID, INVALID_THREAD_ID, ParameterError, UserNotLogged, USER_NOT_LOGGED } from "../errors";
 import { getJSONLD, TJsonLD } from "../../scrape-data/json-ld";
 import shared from "../../shared";
 
@@ -231,7 +231,7 @@ export default class Thread implements ILazy {
     if (!shared.isLogged) throw new UserNotLogged(USER_NOT_LOGGED);
 
     // Check ID
-    if (!this.id && this.id < 1) throw new Error("Invalid thread ID");
+    if (!this.id && this.id < 1) throw new InvalidID(INVALID_THREAD_ID);
 
     // Prepare the url
     this._url = new URL(this.id.toString(), urls.THREADS).toString();