diff --git a/luprex/eris-master/src/eris.c b/luprex/eris-master/src/eris.c
index c49c5f64..5695f41a 100644
--- a/luprex/eris-master/src/eris.c
+++ b/luprex/eris-master/src/eris.c
@@ -1705,6 +1705,7 @@ p_thread(Info *info) {                                          /* ... thread */
 
   /* Write general information. */
   WRITE_VALUE(thread->status, uint8_t);
+  WRITE_VALUE(thread->nextid, uint64_t);
   WRITE_VALUE(eris_savestackidx(thread,
     eris_restorestack(thread, thread->errfunc)), size_t);
   /* These are only used while a thread is being executed or can be deduced:
@@ -1871,6 +1872,7 @@ u_thread(Info *info) {                                                 /* ... */
 
   /* Read general information. */
   thread->status = READ_VALUE(uint8_t);
+  thread->nextid = READ_VALUE(uint64_t);
   thread->errfunc = eris_savestack(thread,
     eris_restorestackidx(thread, READ_VALUE(size_t)));
   if (thread->errfunc) {
diff --git a/luprex/eris-master/src/lstate.c b/luprex/eris-master/src/lstate.c
index c7f2672b..283668cb 100644
--- a/luprex/eris-master/src/lstate.c
+++ b/luprex/eris-master/src/lstate.c
@@ -217,6 +217,7 @@ static void preinit_state (lua_State *L, global_State *g) {
   L->nny = 1;
   L->status = LUA_OK;
   L->errfunc = 0;
+  L->nextid = 0;
 }