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-rw-r--r--lib/rbot/maskdb.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rbot/maskdb.rb b/lib/rbot/maskdb.rb
index f15a442c..435693ec 100644
--- a/lib/rbot/maskdb.rb
+++ b/lib/rbot/maskdb.rb
@@ -11,7 +11,7 @@ module Irc
def add(val, *prefs)
str = prefs.shift or raise 'empty prefs'
- @pre = str if @chi.empty?
+ @pre = str.dup if @chi.empty?
n = 0
@pre.size.times do