1 files changed, 4 insertions, 1 deletions
diff --git a/error.c b/error.c
index b0eb716103..64e5183cca 100644
--- a/error.c
+++ b/error.c
@@ -337,7 +337,10 @@ static VALUE
 exc_backtrace(exc)
     VALUE exc;
 {
-    return rb_iv_get(exc, "bt");
+    ID bt = rb_intern("bt");
+
+    if (!rb_ivar_defined(exc, bt)) return Qnil;
+    return rb_ivar_get(exc, bt);
 }
 
 static VALUE