diff --git a/ChangeLog b/ChangeLog
index cff8ffd3ec..c6b913f59b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Oct 16 17:45:13 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* bootstraptest/runner.rb: check nil before calling `signal?'
+	  for a process status.
+
 Wed Oct 16 17:37:17 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* error.c, internal.h (rb_bug_reporter_add): add a new C-API.
diff --git a/bootstraptest/runner.rb b/bootstraptest/runner.rb
index 75e255428a..5fdfc42a63 100755
--- a/bootstraptest/runner.rb
+++ b/bootstraptest/runner.rb
@@ -321,7 +321,7 @@ def assert_normal_exit(testsrc, *rest)
       $stderr.reopen(old_stderr)
       old_stderr.close
     end
-    if status.signaled?
+    if status && status.signaled?
       signo = status.termsig
       signame = Signal.list.invert[signo]
       unless ignore_signals and ignore_signals.include?(signame)
@@ -407,7 +407,7 @@ def get_result_string(src, opt = '')
     begin
       `#{@ruby} -W0 #{opt} #{filename}`
     ensure
-      raise Interrupt if $?.signaled? && $?.termsig == Signal.list["INT"]
+      raise Interrupt if $? and $?.signaled? && $?.termsig == Signal.list["INT"]
       raise CoreDumpError, "core dumped" if $? and $?.coredump?
     end
   else