[XGAK]

L 08/24/2020 - 17:50:17: [SM] Exception reported: Entity 1 (1) is invalid
L 08/24/2020 - 17:50:17: [SM] Blaming: freaks\the_world.ff2
L 08/24/2020 - 17:50:17: [SM] Call stack trace:
L 08/24/2020 - 17:50:17: [SM]   [0] SetEntPropEnt
L 08/24/2020 - 17:50:17: [SM]   [1] Line 461, the_world.sp::Timer_EndAbility

Here is the code.

public Action:Timer_EndAbility(Handle:htimer, int boss)
{
	ISTIMEFREEZED = false;
	char classname[60];
	SetConVarInt(FindConVar("sv_client_predict"), 1);
	for(new i=1; i<=MaxClients; i++)
	{
		if(IsValidClient(i) && !IsBoss(i))
		{
			SetClientOverlay(i, "");
			if(T_targeted[i]==1)
			{
//				new attacker = GetClientOfUserId(FF2_GetBossUserId(0));
				stabdamage=FF2_GetAbilityArgumentFloat(0, this_plugin_name, ABILITY_NAME1 , 2, 320.0);
				SDKHooks_TakeDamage(i, boss, boss, stabdamage, DMG_SLASH|DMG_ALWAYSGIB);
				T_targeted[i]=0;
			}
			SetEntityMoveType(i, iPrevCollision[i]);
			SetEntProp(i, Prop_Send, "m_bIsPlayerSimulated", 1);
			SetEntProp(i, Prop_Send, "m_bSimulatedEveryTick", 1);
			SetEntProp(i, Prop_Send, "m_bAnimatedEveryTick", 1);
			SetEntProp(i, Prop_Send, "m_bClientSideAnimation", 1);
			SetEntProp(i, Prop_Send, "m_bClientSideFrameReset", 0);
			SetEntPropFloat(i, Prop_Send, "m_flNextAttack", GetGameTime());
			new weapon = GetEntPropEnt(i, Prop_Send, "m_hActiveWeapon");
			if(IsValidEntity(weapon))
			{
				SetEntProp(weapon, Prop_Send, "m_bIsPlayerSimulated", 1);
				SetEntProp(weapon, Prop_Send, "m_bAnimatedEveryTick", 1);
				SetEntProp(weapon, Prop_Send, "m_bSimulatedEveryTick", 1);
				SetEntProp(weapon, Prop_Send, "m_bClientSideAnimation", 1);
				SetEntProp(weapon, Prop_Send, "m_bClientSideFrameReset", 0);
			}
			TF2_RemoveCondition(i, TFCond_FreezeInput);
		}
		else
		{
			iPrevCollision[i]=MOVETYPE_WALK; // Reset
		}
		SDKUnhook(i, SDKHook_OnTakeDamage, OnTakeDamageTW);
	}

	for(int entity = 33; entity <= MAXENTITIES; entity++)
	{
		if(IsValidEntity(entity))
		{
			GetEntityClassname(entity, classname, sizeof(classname));
			if(!StrContains(classname, "obj_"))
			{
				if(TF2_GetObjectType(entity) == TFObject_Dispenser
				|| TF2_GetObjectType(entity) == TFObject_Teleporter
				|| TF2_GetObjectType(entity) == TFObject_Sentry)
				{
					SetEntProp(entity, Prop_Send, "m_bDisabled", 0);
					SetEntProp(entity, Prop_Send, "m_bIsPlayerSimulated", 1);
					SetEntProp(entity, Prop_Send, "m_bAnimatedEveryTick", 1);
					SetEntProp(entity, Prop_Send, "m_bSimulatedEveryTick", 1);
					SetEntProp(entity, Prop_Send, "m_bClientSideAnimation", 1);
					SetEntProp(entity, Prop_Send, "m_bClientSideFrameReset", 1);
				}
			}
			if(!StrContains(classname, "tf_projectile"))
			{
				SetEntPropEnt(entity, Prop_Send, "m_hOwnerEntity", boss);
				if(GetEntProp(entity, Prop_Send, "m_nForceBone") == 998)
					SetEntityMoveType(entity, iPrevCollision[entity]);
				else
					SetEntityMoveType(entity, MOVETYPE_FLY);
				SetVariantInt(BossTeam);
				AcceptEntityInput(entity, "TeamNum", -1, -1, 0);
				SetVariantInt(BossTeam);
				AcceptEntityInput(entity, "SetTeam", -1, -1, 0);
				SetEntProp(entity, Prop_Send, "m_nSkin", (BossTeam==_:TFTeam_Blue) ? 1 : 0);
				// invert angles
				new Float:angle[3];
				GetEntPropVector(entity, Prop_Data, "m_angRotation", angle);
				angle[0] = -angle[0]; //fixAngle(angle[0] + 180.0);
				angle[1] = fixAngle(angle[1] + 180.0);
				// redo velocity
				new Float:velocity[3];
				GetAngleVectors(angle, velocity, NULL_VECTOR, NULL_VECTOR);
				if(StrEqual(classname, "tf_projectile_pipe_remote"))
				{
					SetEntPropEnt(entity, Prop_Data, "m_hThrower", boss);

					SDKCall(g_CTFGrenadeDetonate, entity);
				}
				if(StrEqual(classname, "tf_projectile_pipe"))
				{

					SetEntPropEnt(entity, Prop_Data, "m_hThrower", boss);

					SetEntityMoveType(entity, MOVETYPE_FLYGRAVITY);
					SDKHook(entity, SDKHook_StartTouch, ProjectileTouchHook);
					ScaleVector(velocity, 500.0);
				}
				else
					ScaleVector(velocity, 800.0);
				TeleportEntity(entity, NULL_VECTOR, angle, velocity);

				if(HasEntProp(entity, Prop_Send, "m_iDeflected"))
					SetEntPropEnt(entity, Prop_Send, "m_iDeflected", GetEntProp(entity, Prop_Send, "m_iDeflected")+1);

			}
		}
	}


	return Plugin_Continue;
}

This error appears once in a while. How can I fix it?