diff --git a/lib/pleroma/web/mongooseim/mongoose_im_controller.ex b/lib/pleroma/web/mongooseim/mongoose_im_controller.ex
index 04d823b36..1ed6ee521 100644
--- a/lib/pleroma/web/mongooseim/mongoose_im_controller.ex
+++ b/lib/pleroma/web/mongooseim/mongoose_im_controller.ex
@@ -14,7 +14,7 @@ defmodule Pleroma.Web.MongooseIM.MongooseIMController do
   plug(RateLimiter, [name: :authentication, params: ["user"]] when action == :check_password)
 
   def user_exists(conn, %{"user" => username}) do
-    with %User{} <- Repo.get_by(User, nickname: username, local: true) do
+    with %User{} <- Repo.get_by(User, nickname: username, local: true, deactivated: false) do
       conn
       |> json(true)
     else
@@ -26,7 +26,7 @@ def user_exists(conn, %{"user" => username}) do
   end
 
   def check_password(conn, %{"user" => username, "pass" => password}) do
-    with %User{password_hash: password_hash} <-
+    with %User{password_hash: password_hash, deactivated: false} <-
            Repo.get_by(User, nickname: username, local: true),
          true <- Pbkdf2.checkpw(password, password_hash) do
       conn
diff --git a/test/web/mongooseim/mongoose_im_controller_test.exs b/test/web/mongooseim/mongoose_im_controller_test.exs
index 291ae54fc..1ac2f2c27 100644
--- a/test/web/mongooseim/mongoose_im_controller_test.exs
+++ b/test/web/mongooseim/mongoose_im_controller_test.exs
@@ -9,6 +9,7 @@ defmodule Pleroma.Web.MongooseIMController do
   test "/user_exists", %{conn: conn} do
     _user = insert(:user, nickname: "lain")
     _remote_user = insert(:user, nickname: "alice", local: false)
+    _deactivated_user = insert(:user, nickname: "konata", deactivated: true)
 
     res =
       conn
@@ -30,11 +31,25 @@ test "/user_exists", %{conn: conn} do
       |> json_response(404)
 
     assert res == false
+
+    res =
+      conn
+      |> get(mongoose_im_path(conn, :user_exists), user: "konata")
+      |> json_response(404)
+
+    assert res == false
   end
 
   test "/check_password", %{conn: conn} do
     user = insert(:user, password_hash: Comeonin.Pbkdf2.hashpwsalt("cool"))
 
+    _deactivated_user =
+      insert(:user,
+        nickname: "konata",
+        deactivated: true,
+        password_hash: Comeonin.Pbkdf2.hashpwsalt("cool")
+      )
+
     res =
       conn
       |> get(mongoose_im_path(conn, :check_password), user: user.nickname, pass: "cool")
@@ -49,6 +64,13 @@ test "/check_password", %{conn: conn} do
 
     assert res == false
 
+    res =
+      conn
+      |> get(mongoose_im_path(conn, :check_password), user: "konata", pass: "cool")
+      |> json_response(404)
+
+    assert res == false
+
     res =
       conn
       |> get(mongoose_im_path(conn, :check_password), user: "nobody", pass: "cool")