[K.K.Lv]

#include <sourcemod>

#pragma semicolon 1
#pragma newdecls required

public Plugin myinfo = {
    name = "",
    author = "",
    description = "",
    version = ""
};

enum Struct {
    ArrayList:arrTest,
};

Struct g_ArrTest[Struct];


public void OnPluginStart() {
    AddCommandListener(CommandListener_Callback, "test");

    if (g_ArrTest[arrTest] == null) {
        g_ArrTest[arrTest] = new ArrayList(1);
    }

    g_ArrTest[arrTest].Clear();
}

public void OnPluginEnd() {
    if (g_ArrTest[arrTest] != null) {
        delete g_ArrTest[arrTest];
        g_ArrTest[arrTest] = null;
    }
}

public Action CommandListener_Callback(int client, const char [] command, int argc) {
    if (!IsPlayerAlive(client))
        return Plugin_Handled;

    static int iTimes = 0;
    iTimes++;
    PrintToServer("0x%x", g_ArrTest[arrTest]);

    if (g_ArrTest[arrTest] != null) {

        g_ArrTest[arrTest].Push(iTimes);

        for (int x = 0; x < g_ArrTest[arrTest].Length; x++) {

            PrintToServer("iTimes is \"%d\"", g_ArrTest[arrTest].Get(x));
        }

        PrintToServer("======================End of loop======================\n");
    }

    return Plugin_Handled;
}

handle 0x10000f
Error:

L 06/30/2015 - 11:32:54: [SM] Native "ArrayList.Get" reported: Invalid Handle 0 (error: 4)
L 06/30/2015 - 11:32:54: [SM] Displaying call stack trace for plugin "test.smx":
L 06/30/2015 - 11:32:54: [SM]   [0]  Line 51, test.sp::CommandListener_Callback()

Is it a bug ?