diff --git a/util/bot.py b/util/bot.py
index 194c9896..21492664 100644
--- a/util/bot.py
+++ b/util/bot.py
@@ -21,12 +21,13 @@ def __init__(self, *args, **kwargs):
         kwargs["command_prefix"] = self.get_prefix
         return super().__init__(*args, **kwargs)
 
-    async def get_prefix(self, m):
-        pr = data["prefixes"][argv[-1]]
-        if m.author.id in self.user_prefixes and self.user_prefixes[m.author.id]:
-            pr.append(self.user_prefixes[m.author.id])
-        if m.guild.id in self.guild_prefixes and self.guild_prefixes[m.guild.id]:
-            pr.append(self.guild_prefixes[m.guild.id])
+    async def get_prefix(self, m = None):
+        pr = data["prefixes"][argv[-1]]
+        if not m == None:
+            if m.author.id in self.user_prefixes and self.user_prefixes[m.author.id]:
+                pr.append(self.user_prefixes[m.author.id])
+            if m.guild.id in self.guild_prefixes and self.guild_prefixes[m.guild.id]:
+                pr.append(self.guild_prefixes[m.guild.id])
         return pr
 
     @property