yarn: Don't crash when a command failed with binary output

1 files changed, 1 insertions, 1 deletions

diff --git a/yarn b/yarn
index 00a8a46..811e41d 100755
--- a/yarn
+++ b/yarn
@@ -324,7 +324,7 @@ class YarnRunner(cliapp.Application):
                     'with exit code %d:\n'
                     'Standard output from shell command:\n%s'
                     'Standard error from shell command:\n%s' %
-                    (scenario.name, step.what, step.text, exit,
+                    (str(scenario.name), str(step.what), str(step.text), exit,
                      self.indent(stdout), self.indent(stderr)))
         self.remember_step_timing(
             '%s %s' % (step.what, step.text), stopped - started)