diff --git a/main.py b/main.py
index 074c385..c32817d 100644
--- a/main.py
+++ b/main.py
@@ -229,7 +229,10 @@ async def add_tag(msg: Message):
         return
     for tag in args.split():
         posts = await e621.get_posts(tag)
-        await redis.sadd(REDIS_SENT_KEY, *[post.id for post in posts])
+        if posts:
+            await redis.sadd(REDIS_SENT_KEY, *[post.id for post in posts])
+        else:
+            logging.warning(f'No posts found for tag {tag}')
         await redis.sadd(REDIS_SUBS_KEY, tag)
     await msg.reply(f'Tags {args} added')