update api route

src/routes/models/[userId]/[slug]/+page.svelte

@@ -1,15 +1,17 @@
 <script lang="ts">
+  import { browser } from "$app/environment";
   import { modelStore } from "$lib/stores/use-model";
 	import { onMount } from "svelte";
   export let data;
 
-
-  onMount(() => {
-    modelStore.set({
-      model: data ? data.model : null,
-      open: true
+  if (browser) {
+    onMount(() => {
+      modelStore.set({
+        model: data ? data.model : null,
+        open: true
+      });
     });
-  });
+  }
 </script>
 
 <svelte:head>