gistfile1.diff

diff --git a/lib/rspec/core/formatters/base_formatter.rb b/lib/rspec/core/formatters/base_formatter.rb
index fc181fb..8f88433 100644
--- a/lib/rspec/core/formatters/base_formatter.rb
+++ b/lib/rspec/core/formatters/base_formatter.rb
@@ -118,7 +118,7 @@ module RSpec
 
         def read_failed_line(exception, example)
           original_file = example.file_path.to_s.downcase
-          matching_line = exception.backtrace.detect { |line| line.match(/(.+?):(\d+)(|:\d+)/)[1].downcase == original_file.downcase }
+          matching_line = exception.backtrace.detect { |line| (line.match(/(.+?):(\d+)(|:\d+)/).downcase == original_file.downcase) rescue false }
 
           return "Unable to find matching line from backtrace" if matching_line.nil?