1 files changed, 4 insertions, 1 deletions
diff --git a/lib/rake/trace_output.rb b/lib/rake/trace_output.rb
index e4d61cfb93..1cd19451ca 100644
--- a/lib/rake/trace_output.rb
+++ b/lib/rake/trace_output.rb
@@ -11,7 +11,10 @@ module Rake
       if strings.empty?
         output = sep
       else
-        output = strings.map { |s| s.end_with?(sep) ? s : s + sep }.join
+        output = strings.map { |s|
+          next if s.nil?
+          s =~ /#{sep}$/ ? s : s + sep
+        }.join
       end
       out.print(output)
     end