lib/ipizza/util.rb in ipizza-0.5.2 vs lib/ipizza/util.rb in ipizza-0.5.3

@@ -20,10 +20,10 @@
         signature = Base64.encode64(signature).gsub(/\n/, '')
       end
 
       # Calculates and adds control number using 7-3-1 algoritm for Estonian banking account and reference numbers.
       def sign_731(ref_num)
-        arr = ref_num.to_s.reverse!.split('')
+        arr = ref_num.to_s.dup.reverse!.split('')
         m = 0
         r = 0
 
         arr.each do |e|
           m = case m