[Lux]

It literally tells you why...

Spoiler

PHP Code:

HasEntProp(entity, Prop_Send, "m_vecOrigin"); 


EDIT:

Ok ill be abit more helpful
You are passing an entity index into a timer, never do that Pass an entity reference instead.

https://sm.alliedmods.net/new-api/ha...tIndexToEntRef
https://sm.alliedmods.net/new-api/ha...tRefToEntIndex

PHP Code:

public void OnEntityCreated(int entity, const char[] classname)
{
    if (StrEqual(classname, "healthkit"))
    {
        Handle hDatapack;
        CreateDataTimer(Healthkit_Timer_Tickrate, Healthkit, hDatapack, TIMER_REPEAT|TIMER_FLAG_NO_MAPCHANGE);// you really sure you want it to be a repeat timer?
        WritePackCell(hDatapack, EntIndexToEntRef(entity));
        WritePackFloat(hDatapack, GetGameTime()+Healthkit_Timer_Timeout);
        g_fLastHeight[entity] = -9999.0;
        g_iTimeCheckHeight[entity] = -9999.0;
        SDKHook(entity, SDKHook_VPhysicsUpdate, HealthkitGroundCheck);
        CreateTimer(0.1, HealthkitGroundCheckTimer, EntIndexToEntRef(entity), TIMER_REPEAT|TIMER_FLAG_NO_MAPCHANGE);// you really sure you want it to be a repeat timer?
    }
}

// return Plugin_Stop = stop timer, return Plugin_Continue = continue repeat the timer with repeat flag.
public Action HealthkitGroundCheckTimer(Handle timer, any entref)
{
    int entity = EntRefToEntIndex(entref));// converts an entity reference back to an ent index will be -1(0xFFFFFFFF)(INVALID_ENT_REFERENCE ) if invalid
    if(entref == INVALID_ENT_REFERENCE || !IsValidEntity(entref))
        return Plugin_Stop;// CLOSE TIMERS don't leave them running if you don't need them.
    
    float fGameTime = GetGameTime();
    if (fGameTime-g_fTimeCheck[entity] >= 1.0)
    {
        float fOrigin[3];
        GetEntPropVector(entity, Prop_Send, "m_vecOrigin", fOrigin);
        //int iRoundHeight = RoundFloat(fOrigin[2]);
        int iRoundHeight = RoundFloat(fOrigin[2]);
        if (iRoundHeight == g_iTimeCheckHeight[entity])
        {
            g_fTimeCheck[entity] = GetGameTime();
            SDKUnhook(entity, SDKHook_VPhysicsUpdate, HealthkitGroundCheck);
            SDKHook(entity, SDKHook_VPhysicsUpdate, OnEntityPhysicsUpdate);
        }
    }
    return Plugin_Continue;// because you put timer repeat flag i'm going to assume you want it to repeat i don't really want to dig into 6k lines sorry
}

public Action Healthkit(Handle timer, Handle hDatapack)
{
    ResetPack(hDatapack);
    int entity = EntRefToEntIndex(ReadPackCell(hDatapack));//converting an entref back to an index, if it's -1 means that exact entity nolonger exists.
    float fEndTime = ReadPackFloat(hDatapack);
    float fGameTime = GetGameTime();
    
    if (entity != INVALID_ENT_REFERENCE && IsValidEntity(entity) && fGameTime <= fEndTime)
    {
        float fOrigin[3];
        GetEntPropVector(entity, Prop_Send, "m_vecOrigin", fOrigin);
        if (g_fLastHeight[entity] == -9999.0)
        {
            g_fLastHeight[entity] = 0.0;
            EmitSoundToAll("Lua_sounds/healthkit_healing.wav", entity, SNDCHAN_STATIC, _, _, 0.7);
        }
        //fOrigin[2] += 16.0;
        fOrigin[2] += 1.0;
        //TE_SetupBeamRingPoint(beamPos, 1.0, Revive_Indicator_Radius, g_iBeaconBeam, g_iBeaconHalo, 0, 15, 5.0, 3.0, 5.0, {255, 0, 0, 255}, 1, (FBEAM_FADEIN, FBEAM_FADEOUT));
        TE_SetupBeamRingPoint(fOrigin, 15.0, Healthkit_Radius*0.55, g_iBeaconBeam, g_iBeaconHalo, 0, 5, 1.0, 1.0, 2.0, {0, 204, 100, 255},1,0);
        // // //TE_SetupBeamRingPoint(fOrigin, 5.0, Healthkit_Radius*1.95, g_iBeaconBeam, g_iBeaconHalo, 0, 30, 5.0, 3.0, 5.0, {0, 255, 0, 255}, 1, (FBEAM_FADEOUT));
        //TE_SetupBeamRingPoint(fOrigin, 10.0, Healthkit_Radius*1.95, g_iBeaconBeam, g_iBeaconHalo, 0, 30, 0.6, 3.0, 0.0, {0, 204, 102, 255}, 3, 0);
        TE_SendToAll();
        fOrigin[2] -= 16.0;
        if (fOrigin[2] != g_fLastHeight[entity])
        {
            g_fLastHeight[entity] = fOrigin[2];
        }
        else
        {
            float fAng[3];
            GetEntPropVector(entity, Prop_Send, "m_angRotation", fAng);
            if (fAng[1] > 89.0 || fAng[1] < -89.0)
                fAng[1] = 90.0;
            if (fAng[2] > 89.0 || fAng[2] < -89.0)
            {
                fAng[2] = 0.0;
                fOrigin[2] -= 6.0;
                TeleportEntity(entity, fOrigin, fAng, view_as<float>({0.0, 0.0, 0.0}));
                fOrigin[2] += 6.0;
                EmitSoundToAll("ui/sfx/cl_click.wav", entity, SNDCHAN_STATIC, _, _, 1.0);
            }
        }
        for (int iPlayer = 1;iPlayer <= MaxClients;iPlayer++)
        {
            if (IsClientInGame(iPlayer) && IsPlayerAlive(iPlayer) && GetClientTeam(iPlayer) == 2)
            {
                float fPlayerOrigin[3];
                GetClientEyePosition(iPlayer, fPlayerOrigin);
                if (GetVectorDistance(fPlayerOrigin, fOrigin) <= Healthkit_Radius)
                {
                    DataPack hData = CreateDataPack();
                    WritePackCell(hData, entity);
                    WritePackCell(hData, iPlayer);
                    fOrigin[2] += 32.0;
                    Handle trace = TR_TraceRayFilterEx(fPlayerOrigin, fOrigin, MASK_SOLID, RayType_EndPoint, Filter_ClientSelf, hData);
                    delete hData;
                    if (!TR_DidHit(trace))
                    {
                        int iMaxHealth = GetEntProp(iPlayer, Prop_Data, "m_iMaxHealth");
                        int iHealth = GetEntProp(iPlayer, Prop_Data, "m_iHealth");
                        if (iMaxHealth > iHealth)
                        {
                            iHealth += GetRandomInt(Healthkit_Healing_Per_Tick_Min, Healthkit_Healing_Per_Tick_Max);
                            if (iHealth >= iMaxHealth)
                            {
                                EmitSoundToAll("Lua_sounds/healthkit_complete.wav", iPlayer, SNDCHAN_STATIC, _, _, 1.0);
                                iHealth = iMaxHealth;
                                //PrintToChat(iPlayer, "\x05竊긌ua \x01@ \x03You are completely healed!");
                                PrintCenterText(iPlayer, "Healed !\n\n \n %d %%\n \n \n \n \n \n \n \n", iMaxHealth);
                            }
                            else PrintCenterText(iPlayer, "Healing...\n\n \n   %d %%\n \n \n \n \n \n \n \n", iHealth);
                            SetEntProp(iPlayer, Prop_Data, "m_iHealth", iHealth);
                        }
                    }
                }
            }
        }
    }
    else
    {
        return Plugin_Stop;// You are leaking handles and you are using a repeat time while passing an entindex to a timer don't pass the entindex use a reference.
    }
    return Plugin_Continue;// because you are using a repeat timer flag i'm going to assume you want it to repeat.
} 


I have no idea what else is wrong with this code, i did not look too much into it i'm assuming you want it to be a repeat timer because you are passing a repeat flag into both of them, if you don't want it to be repeat a repeat timer don't pass the repeat flag.