diff --git a/BOT/botscript.py b/BOT/botscript.py
index 6e2d637..ab9c320 100644
--- a/BOT/botscript.py
+++ b/BOT/botscript.py
@@ -181,6 +181,12 @@ set_bot(bot)  # Register bot globally for other modules
 register_stack_commands(bot)
 
 
+@bot.tree.error
+async def on_app_command_error(interaction: discord.Interaction, error: app_commands.AppCommandError):
+    """Fallback slash-command error handler for commands without local handlers."""
+    await permission_fail(interaction, error)
+
+
 
 @bot.event
 async def on_ready():
diff --git a/BOT/utils.py b/BOT/utils.py
index 913ffd0..711e1c0 100644
--- a/BOT/utils.py
+++ b/BOT/utils.py
@@ -528,8 +528,8 @@ def is_blacklisted():
     """Return an app-command check that rejects blacklisted users or guilds.
 
     Blacklisted users come from the shared BLACKLIST.json (see
-    ``shared_store.check_user_blacklist``); entries there may be a plain id or
-    ``[id, reason]``.
+    ``shared_store.check_user_blacklist``); entries there may include an
+    internal comment/name and an optional reason.
 
     Raises:
         BlacklistCheckFailure: If the guild or user is blacklisted,
@@ -577,6 +577,13 @@ async def permission_fail(interaction: discord.Interaction, error):
     lang = await guild_lang(interaction.guild_id) if interaction.guild_id else "en"
     if isinstance(error, BlacklistCheckFailure):
         reason = error.args[0] if error.args else None
+        logging.warning(
+            "Blacklisted command attempt blocked: user_id=%s guild_id=%s command=%s reason=%r",
+            getattr(interaction.user, "id", None),
+            interaction.guild_id,
+            interaction.command.qualified_name if interaction.command else None,
+            reason,
+        )
         desc = t(lang, "permission.blacklisted_desc")
         if reason:
             desc += "\n" + t(lang, "permission.reason_line", reason=reason)