diff --git a/mautrix_telegram/portal_util/message_convert.py b/mautrix_telegram/portal_util/message_convert.py
index 16aa96e8..88e9b48b 100644
--- a/mautrix_telegram/portal_util/message_convert.py
+++ b/mautrix_telegram/portal_util/message_convert.py
@@ -736,7 +736,7 @@ class TelegramMessageConverter:
 def _parse_document_attributes(attributes: list[TypeDocumentAttribute]) -> DocAttrs:
     name, mime_type, is_sticker, sticker_alt, width, height = None, None, False, None, 0, 0
     is_gif, is_audio, is_voice, duration, waveform = False, False, False, 0, bytes()
-    sticker_pack_ref = {}
+    sticker_pack_ref = None
     for attr in attributes:
         if isinstance(attr, DocumentAttributeFilename):
             name = name or attr.file_name
@@ -746,8 +746,8 @@ def _parse_document_attributes(attributes: list[TypeDocumentAttribute]) -> DocAt
             sticker_alt = attr.alt
             if isinstance(attr.stickerset, InputStickerSetID):
                 sticker_pack_ref = {
-                    "id": attr.stickerset.id,
-                    "access_hash": attr.stickerset.access_hash,
+                    "id": str(attr.stickerset.id),
+                    "access_hash": str(attr.stickerset.access_hash),
                 }
             elif isinstance(attr.stickerset, InputStickerSetShortName):
                 sticker_pack_ref = {"short_name": attr.stickerset.short_name}
@@ -804,6 +804,7 @@ def _parse_document_meta(
     if attrs.is_sticker:
         info["fi.mau.telegram.sticker"] = {
             "alt": attrs.sticker_alt,
+            "id": str(document.id),
             "pack": attrs.sticker_pack_ref,
         }