From f498b8a04926574db081b6b088ec3e7be5c6c06f Mon Sep 17 00:00:00 2001
From: Michele Caini <michele.caini@gmail.com>
Date: Wed, 6 Nov 2019 22:31:46 +0100
Subject: [PATCH] registry::prepare: strictier check

---
 src/entt/entity/registry.hpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/entt/entity/registry.hpp b/src/entt/entity/registry.hpp
index 767da1814..cee38e2e7 100644
--- a/src/entt/entity/registry.hpp
+++ b/src/entt/entity/registry.hpp
@@ -332,7 +332,10 @@ public:
      */
     template<typename Component, typename... Args>
     void prepare(Args &&... args) {
-        ENTT_ASSERT(std::none_of(pools.cbegin(), pools.cend(), [ctype = to_integer(type<Component>())](auto &&pdata) {return pdata.runtime_type == ctype; }));
+        ENTT_ASSERT(std::none_of(pools.cbegin(), pools.cend(), [ctype = to_integer(type<Component>())](auto &&pdata) {
+            return pdata.pool && pdata.runtime_type == ctype;
+        }));
+
         [[maybe_unused]] auto *cpool = assure<Component>(std::forward<Args>(args)...);
         ENTT_ASSERT(cpool->size() == 0);
     }