context proc may be cfunc; fix #2609

mrbgems/mruby-eval/src/eval.c

@@ -23,6 +23,9 @@ get_closure_irep(mrb_state *mrb, int level)
   if (!e) return NULL;
   proc = mrb->c->cibase[e->cioff].proc;
 
+  if (MRB_PROC_CFUNC_P(proc)) {
+    return NULL;
+  }
   return proc->body.irep;
 }
 
@@ -34,7 +37,7 @@ search_variable(mrb_state *mrb, mrb_sym vsym, int bnest)
   int pos;
 
   for (level = 0; (virep = get_closure_irep(mrb, level)); level++) {
-    if (virep->lv == NULL) {
+    if (!virep || virep->lv == NULL) {
       continue;
     }
     for (pos = 0; pos < virep->nlocals - 1; pos++) {