request_log_analyzer/controller.rb:277:in handle_progress': undefined method set' for nil:NilClass (NoMethodError)

[phspies]

Not sure if this is already logged but could you provide some insights into this error:

Request-log-analyzer, by Willem van Bergen and Bart ten Brinke - version 1.13.4
Website: http://railsdoctors.com

^Cproduction.log:           10% [======================                                                                                                                                                                                                         ] Time: 00:01:04
Caught interrupt! Stopping parsing...
/usr/local/rvm/gems/ruby-2.2.3/gems/request-log-analyzer-1.13.4/lib/request_log_analyzer/controller.rb:277:in `handle_progress': undefined method `set' for nil:NilClass (NoMethodError)
        from /usr/local/rvm/gems/ruby-2.2.3/gems/request-log-analyzer-1.13.4/lib/request_log_analyzer/controller.rb:256:in `block in initialize'
        from /usr/local/rvm/gems/ruby-2.2.3/gems/request-log-analyzer-1.13.4/lib/request_log_analyzer/source/log_parser.rb:181:in `call'
        from /usr/local/rvm/gems/ruby-2.2.3/gems/request-log-analyzer-1.13.4/lib/request_log_analyzer/source/log_parser.rb:181:in `parse_io_19'
        from /usr/local/rvm/gems/ruby-2.2.3/gems/request-log-analyzer-1.13.4/lib/request_log_analyzer/source/log_parser.rb:130:in `block in parse_file'
        from /usr/local/rvm/gems/ruby-2.2.3/gems/request-log-analyzer-1.13.4/lib/request_log_analyzer/source/log_parser.rb:130:in `open'
        from /usr/local/rvm/gems/ruby-2.2.3/gems/request-log-analyzer-1.13.4/lib/request_log_analyzer/source/log_parser.rb:130:in `parse_file'
        from /usr/local/rvm/gems/ruby-2.2.3/gems/request-log-analyzer-1.13.4/lib/request_log_analyzer/source/log_parser.rb:76:in `each_request'
        from /usr/local/rvm/gems/ruby-2.2.3/gems/request-log-analyzer-1.13.4/lib/request_log_analyzer/controller.rb:334:in `run!'
        from /usr/local/rvm/gems/ruby-2.2.3/gems/request-log-analyzer-1.13.4/bin/request-log-analyzer:133:in `<top (required)>'
        from /usr/local/rvm/gems/ruby-2.2.3/bin/request-log-analyzer:23:in `load'
        from /usr/local/rvm/gems/ruby-2.2.3/bin/request-log-analyzer:23:in `<main>'
        from /usr/local/rvm/gems/ruby-2.2.3/bin/ruby_executable_hooks:15:in `eval'
        from /usr/local/rvm/gems/ruby-2.2.3/bin/ruby_executable_hooks:15:in `<main>'