1 files changed, 1 insertions, 1 deletions
diff --git a/lib.c b/lib.c
index c4f191bc..196a6b56 100644
--- a/lib.c
+++ b/lib.c
@@ -349,7 +349,7 @@ static val seq_iterable(seq_info_t si)
   case FLNUM:
     return t;
   case COBJ:
-    if (get_special_slot(si.obj, iter_begin_m))
+    if (obj_struct_p(si.obj) && get_special_slot(si.obj, iter_begin_m))
       return t;
     break;
   default: