Set several timers variable value to the INVALID_HANDLE after KillTimer call.

src/zr/overlays.inc

@@ -154,6 +154,7 @@ OverlaysOnRoundStart()
     new Float:overlaysupdate = GetConVarFloat(g_hCvarsList[CVAR_OVERLAYS_UPDATE_TIME]);
     if (overlaysupdate <= 0.0)
     {
+        tOverlays = INVALID_HANDLE;
         return;
     }
 

src/zr/respawn.inc

@@ -98,6 +98,7 @@ RespawnOnClientDeath(client, attacker, const String:weapon[])
     // If player was infected, then stop.
     if (StrEqual(weapon, "zombie_claws_of_death", false))
     {
+        tRespawn[client] = INVALID_HANDLE;
         return;
     }
 
@@ -105,6 +106,7 @@ RespawnOnClientDeath(client, attacker, const String:weapon[])
     new bool:respawn = GetConVarBool(g_hCvarsList[CVAR_RESPAWN]);
     if (!respawn)
     {
+        tRespawn[client] = INVALID_HANDLE;
         return;
     }