1 files changed, 7 insertions, 5 deletions
diff --git a/mrbgems/mruby-proc-ext/src/proc.c b/mrbgems/mruby-proc-ext/src/proc.c
index 8c9e300dc..0322afe67 100644
--- a/mrbgems/mruby-proc-ext/src/proc.c
+++ b/mrbgems/mruby-proc-ext/src/proc.c
@@ -140,14 +140,16 @@ mrb_proc_parameters(mrb_state *mrb, mrb_value self)
   parameters_list[4].size = MRB_ASPEC_BLOCK(aspec);
 
   parameters = mrb_ary_new_capa(mrb, irep->nlocals-1);
+
   for (i = 0, p = parameters_list; p->name; p++) {
     mrb_value sname = mrb_symbol_value(mrb_intern_cstr(mrb, p->name));
     for (j = 0; j < p->size; i++, j++) {
-      mrb_assert(i < (irep->nlocals-1));
-      mrb_ary_push(mrb, parameters, mrb_assoc_new(mrb,
-        sname,
-        mrb_symbol_value(irep->lv[i].name)
-      ));
+      mrb_value a = mrb_ary_new(mrb);
+      mrb_ary_push(mrb, a, sname);
+      if (irep->lv[i].name) {
+        mrb_ary_push(mrb, a, mrb_symbol_value(irep->lv[i].name));
+      }
+      mrb_ary_push(mrb, parameters, a);
     }
   }
   return parameters;