fix: adding/removing bots during round restart causes "SZ_GetSpace: tried to write to an uninitialized sizebuf_t: ???"

inc/yapb.h

@@ -822,6 +822,7 @@ private:
    bool updateLiftStates ();
    bool canRunHeavyWeight ();
 
+   void markStale ();
    void instantChatter (int type);
    void update ();
    void runMovement ();

src/linkage.cpp

@@ -55,6 +55,13 @@ namespace variadic {
       // sometimes actually by their side, that's why we strongly recommend to check it here too. In
       // case it's a bot asking for a client command, we handle it like we do for bot commands
 
+      if (game.isNullEntity (ent)) {
+         if (game.is (GameFlags::Metamod)) {
+            RETURN_META (MRES_SUPERCEDE);
+         }
+         return;
+      }
+
       va_list ap;
       auto buffer = strings.chars ();
 
@@ -62,7 +69,7 @@ namespace variadic {
       vsnprintf (buffer, StringBuffer::StaticBufferSize, format, ap);
       va_end (ap);
 
-      if (util.isFakeClient (ent)) {
+      if (util.isFakeClient (ent) || (ent->v.flags & FL_DORMANT)) {
          auto bot = bots[ent];
 
          if (bot) {
@@ -227,9 +234,6 @@ CR_EXPORT int GetEntityAPI (gamefuncs_t *table, int) {
 
       for (auto &bot : bots) {
          if (bot->pev == &ent->v) {
-            bot->showChaterIcon (false);
-
-            conf.clearUsedName (bot.get ()); // clear the bot name
             bots.erase (bot.get ()); // remove the bot from bots array
 
             break;

src/manager.cpp

@@ -1112,6 +1112,11 @@ bool BotManager::isTeamStacked (int team) {
 void BotManager::erase (Bot *bot) {
    for (auto &e : m_bots) {
       if (e.get () == bot) {
+         bot->showChaterIcon (false);
+         bot->markStale ();
+
+         conf.clearUsedName (bot); // clear the bot name
+
          e.reset ();
          m_bots.remove (e); // remove from bots array
 
@@ -1418,14 +1423,20 @@ void Bot::kick () {
    if (!(pev->flags & FL_CLIENT) || strings.isEmpty (username)) {
       return;
    }
-
-   // clear fakeclient bit
-   pev->flags &= ~FL_FAKECLIENT;
+   markStale ();
 
    game.serverCommand ("kick \"%s\"", username);
    ctrl.msg ("Bot '%s' kicked.", username);
 }
 
+void Bot::markStale () {
+   // clear fakeclient bit
+   pev->flags &= ~FL_FAKECLIENT;
+
+   // make as not receiveing any messages
+   pev->flags |= FL_DORMANT;
+}
+
 void Bot::updateTeamJoin () {
    // this function handles the selection of teams & class