diff --git a/bot.py b/bot.py
index 68cc4ed..5c37a0a 100755
--- a/bot.py
+++ b/bot.py
@@ -87,7 +87,7 @@ class BotClient(discord.Client):
             ["node", "calc_main.js", "--"] + args, stdout=sp.PIPE, stderr=sp.PIPE
         )
         if proc.returncode != 0:
-            _log.error(f"running calculator: {proc.stderr}")
+            raise Error(proc.stderr.decode())
         return proc.stdout.decode()
 
     def is_replay(self, message: discord.Message) -> bool: