KMODE_EXCEPTION_NOT_HANDLED when calling RtLImageNtHeader

I'm trying to get PIMAGE_NT_HEADERS64 from KernelBase by using RtlImageNtHeader but I keep getting KMODE_EXCEPTION_NOT_HANDLED bsod error message whenever I run the driver. (PS I have already checked and GetKernelBase is not returning nullptr & that GetKernelBase is not causing the BSOD)

How I get KernelBase:

PVOID GetKernelBase(OUT PULONG pSize)
{
    NTSTATUS status = STATUS_SUCCESS;
    ULONG bytes = 0;
    PRTL_PROCESS_MODULES pMods = NULL;
    PVOID checkPtr = NULL;
    UNICODE_STRING routineName;
    PVOID g_KernelBase = nullptr;
    ULONG g_KernelSize;

    RtlUnicodeStringInit(&routineName, L"NtOpenFile");

    checkPtr = MmGetSystemRoutineAddress(&routineName);
    if (checkPtr == NULL)
        return NULL;

    // Protect from UserMode AV
    status = ZwQuerySystemInformation(SYSTEM_INFORMATION_CLASS::SystemModuleInformation, 0, bytes, &bytes);
    if (bytes == 0)
    {
        DbgPrint("BlackBone: %s: Invalid SystemModuleInformation size\n", __FUNCTION__);
        return NULL;
    }

    pMods = (PRTL_PROCESS_MODULES)ExAllocatePoolWithTag(NonPagedPool, bytes, BB_POOL_TAG);
    RtlZeroMemory(pMods, bytes);

    status = ZwQuerySystemInformation(SystemModuleInformation, pMods, bytes, &bytes);

    if (NT_SUCCESS(status))
    {
        PRTL_PROCESS_MODULE_INFORMATION pMod = pMods->Modules;

        for (ULONG i = 0; i < pMods->NumberOfModules; i++)
        {
            // System routine is inside module
            if (checkPtr >= pMod[i].ImageBase &&
                checkPtr < (PVOID)((PUCHAR)pMod[i].ImageBase + pMod[i].ImageSize))
            {
                g_KernelBase = pMod[i].ImageBase;
                g_KernelSize = pMod[i].ImageSize;
                if (pSize)
                    * pSize = g_KernelSize;
                DbgPrint("KernelBase found! Size: " + g_KernelSize);
                break;
            }
        }
    }

    if (pMods)
        ExFreePoolWithTag(pMods, BB_POOL_TAG);

    return g_KernelBase;
}

How I use RtlImageNtHeader:

PULONG pSize = NULL;
PVOID base = GetKernelBase(pSize);
PIMAGE_NT_HEADERS64 pHdr = RtlImageNtHeader(base); // causing crash

Thanks in advance