990806

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_3@509 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 2 deletions

diff --git a/object.c b/object.c
index 319abd3793..9c5163a248 100644
--- a/object.c
+++ b/object.c
@@ -465,8 +465,12 @@ rb_mod_clone(module)
     clone->super = RCLASS(module)->super;
     clone->iv_tbl = 0;
     clone->m_tbl = 0;		/* avoid GC crashing  */
-    clone->iv_tbl = st_copy(RCLASS(module)->iv_tbl);
-    clone->m_tbl = st_copy(RCLASS(module)->m_tbl);
+    if (RCLASS(module)->iv_tbl) {
+	clone->iv_tbl = st_copy(RCLASS(module)->iv_tbl);
+    }
+    if (RCLASS(module)->m_tbl) {
+	clone->m_tbl = st_copy(RCLASS(module)->m_tbl);
+    }
 
     return (VALUE)clone;
 }