diff --git a/index.php b/index.php
index 96e2cedd..0549b8d9 100755
--- a/index.php
+++ b/index.php
@@ -342,7 +342,7 @@ else if(isset($_GET['do']))
                         chdir("mods");
                         foreach(glob("*") as $modname) {
                             // server_announce = true
-                            if(isset($_POST[$modname])) {
+                            if(isset($_POST[$modname]) && !is_dir("mtm_db/worlds/$userid/worlds/world/worldmods/" . $_POST[$modname] . "/")) {
                                 echo "Copying $modname...";
                                 chdir("..");
                                 file_put_contents("mtm_db/events/$userid", "cp -a mods/$modname mtm_db/worlds/$userid/worlds/world/worldmods/$modname");