Found the solution, importing too much topics in a single category hangs the nodebb, import some data than move it to some temporary category. Thasn import remaining data, meanwhile delete mongodb import Garbaze in using these mongo commands db.objects.update({},{$unset: {_imported_tid:1}},{multi: true}); db.objects.update({},{$unset: {_imported_uid:1}},{multi: true}); db.objects.update({},{$unset: {_imported_cid:1}},{multi: true}); db.objects.update({},{$unset: {_imported_slug:1}},{multi: true}); db.objects.update({},{$unset: {_imported_locked:1}},{multi: true}); db.objects.update({},{$unset: {_imported_path:1}},{multi: true}); db.objects.update({},{$unset: {_imported_title:1}},{multi: true}); db.objects.update({},{$unset: {_imported_content:1}},{multi: true}); db.objects.update({},{$unset: {_imported_guest:1}},{multi: true}); db.objects.update({},{$unset: {_imported_ip:1}},{multi: true}); db.objects.update({},{$unset: {_imported_user_slug:1}},{multi: true}); db.objects.update({},{$unset: {_imported_user_path:1}},{multi: true}); db.objects.update({},{$unset: {_imported_category_path:1}},{multi: true}); db.objects.update({},{$unset: {_imported_category_slug:1}},{multi: true}); But keep in mind this will also delete the history of import will result in duplicate categories get imported or the posts, to prevent this keep writing post ids and category ids which you imported and delete them from the old database.