diff --git a/test/test_trustroot.rb b/test/test_trustroot.rb
index 28e2b7b7..4b683d11 100644
--- a/test/test_trustroot.rb
+++ b/test/test_trustroot.rb
@@ -11,7 +11,7 @@ def _test_sanity(case_, sanity, desc)
       assert(tr.sane?)
       assert(OpenID::TrustRoot::TrustRoot.check_sanity(case_))
     elsif sanity == 'insane'
-      assert(!tr.sane?)
+      assert(!tr || !tr.sane?)
       assert(!OpenID::TrustRoot::TrustRoot.check_sanity(case_))
     else
       assert(tr.nil?, case_)