Update rbreadline.rb

lib/rbreadline.rb

@@ -6131,9 +6131,8 @@ module RbReadline
   end
   def alloc_history_entry(string, ts)
-    string = string.encode('UTF-8', invalid: :replace, undef: :replace, replace: '')
     temp = Struct.new(:line,:data,:timestamp).new
-    temp.line = string ? string.delete(0.chr) : string
+    temp.line = string ? string.encode('UTF-8', invalid: :replace, undef: :replace, replace: '').delete(0.chr) : string
     temp.data = nil
     temp.timestamp = ts