diff --git a/src/common/Timer.cpp b/src/common/Timer.cpp
index 72881273a..c9515856c 100644
--- a/src/common/Timer.cpp
+++ b/src/common/Timer.cpp
@@ -25,8 +25,6 @@
 // *
 // ******************************************************************
 
-#include <core\kernel\exports\xboxkrnl.h>
-
 #ifdef _WIN32
 #include <windows.h>
 #endif
@@ -36,6 +34,7 @@
 #include "Timer.h"
 #include "common\util\CxbxUtil.h"
 #include "core\kernel\support\EmuFS.h"
+#include "core/kernel/exports/EmuKrnlPs.hpp"
 #ifdef __linux__
 #include <time.h>
 #endif
@@ -218,7 +217,7 @@ void Timer_Start(TimerObject* Timer, uint64_t Expire_MS)
 	Timer->ExpireTime_MS.store(Expire_MS);
 	if (Timer->IsXboxTimer) {
 		xbox::HANDLE hThread;
-		xbox::PsCreateSystemThread(&hThread, xbox::zeroptr, ClockThread, Timer, FALSE);
+		CxbxrCreateThread(&hThread, xbox::zeroptr, ClockThread, Timer, FALSE);
 	}
 	else {
 		std::thread(ClockThread, Timer).detach();
diff --git a/src/core/kernel/exports/EmuKrnlPs.cpp b/src/core/kernel/exports/EmuKrnlPs.cpp
index 1e4b7b599..c4a63ec3a 100644
--- a/src/core/kernel/exports/EmuKrnlPs.cpp
+++ b/src/core/kernel/exports/EmuKrnlPs.cpp
@@ -154,7 +154,7 @@ static unsigned int WINAPI PCSTProxy
 	return 0; // will never be reached
 }
 
-// Placeholder system function, instead of XapiThreadStartup
+// Placeholder system function
 xbox::void_xt NTAPI PspSystemThreadStartup
 (
 	IN xbox::PKSTART_ROUTINE StartRoutine,
@@ -231,6 +231,35 @@ xbox::void_xt NTAPI PspReaperRoutine(
 	}
 }
 
+xbox::ntstatus_xt NTAPI CxbxrCreateThread
+(
+	OUT xbox::PHANDLE         ThreadHandle,
+	OUT xbox::PHANDLE         ThreadId OPTIONAL,
+	IN  xbox::PKSTART_ROUTINE StartRoutine,
+	IN  xbox::PVOID           StartContext,
+	IN  xbox::boolean_xt      DebuggerThread
+)
+{
+	Xbe::TLS* XbeTls = (Xbe::TLS*)CxbxKrnl_Xbe->m_Header.dwTLSAddr;
+	xbox::ulong_xt TlsDataSize = (XbeTls->dwDataEndAddr - XbeTls->dwDataStartAddr);
+	TlsDataSize += XbeTls->dwSizeofZeroFill + 15;
+	TlsDataSize = (TlsDataSize & ~15) + 4;
+	// Verify EmuGenerateFS's TlsData's setup is carry over to XapiThreadStartup function.
+	// Instead of using PspSystemThreadStartup which is entirely different function.
+	return xbox::PsCreateSystemThreadEx(
+		/*OUT*/ThreadHandle,
+		/*ThreadExtensionSize=*/0,
+		/*KernelStackSize=*/KERNEL_STACK_SIZE,
+		TlsDataSize,
+		/*OUT*/ThreadId,
+		/*StartRoutine=*/StartRoutine,
+		StartContext,
+		/*CreateSuspended=*/FALSE,
+		/*DebuggerThread=*/DebuggerThread,
+		/*SystemRoutine=*/PspSystemThreadStartup // should use XapiThreadStartup
+	);
+}
+
 static xbox::KDPC PsReaperDpc;
 xbox::void_xt xbox::PsInitSystem()
 {
diff --git a/src/core/kernel/exports/EmuKrnlPs.hpp b/src/core/kernel/exports/EmuKrnlPs.hpp
index 7533803d9..42ae4b73a 100644
--- a/src/core/kernel/exports/EmuKrnlPs.hpp
+++ b/src/core/kernel/exports/EmuKrnlPs.hpp
@@ -26,3 +26,12 @@ namespace xbox
 {
 	void_xt PsInitSystem();
 };
+
+xbox::ntstatus_xt NTAPI CxbxrCreateThread
+(
+	OUT xbox::PHANDLE         ThreadHandle,
+	OUT xbox::PHANDLE         ThreadId OPTIONAL,
+	IN  xbox::PKSTART_ROUTINE StartRoutine,
+	IN  xbox::PVOID           StartContext,
+	IN  xbox::boolean_xt      DebuggerThread
+);
diff --git a/src/core/kernel/init/CxbxKrnl.cpp b/src/core/kernel/init/CxbxKrnl.cpp
index 88093c0b7..9fd11d04d 100644
--- a/src/core/kernel/init/CxbxKrnl.cpp
+++ b/src/core/kernel/init/CxbxKrnl.cpp
@@ -1432,7 +1432,7 @@ static void CxbxrKrnlInitHacks()
 	EmuX86_Init();
 	// Create the interrupt processing thread
 	xbox::HANDLE hThread;
-	xbox::PsCreateSystemThread(&hThread, xbox::zeroptr, CxbxKrnlInterruptThread, xbox::zeroptr, FALSE);
+	CxbxrCreateThread(&hThread, xbox::zeroptr, CxbxKrnlInterruptThread, xbox::zeroptr, FALSE);
 	// Start the kernel clock thread
 	TimerObject* KernelClockThr = Timer_Create(CxbxKrnlClockThread, nullptr, "Kernel clock thread", true);
 	Timer_Start(KernelClockThr, SCALE_MS_IN_NS);
diff --git a/src/core/kernel/support/EmuFS.cpp b/src/core/kernel/support/EmuFS.cpp
index c5293a4f9..7a84c68d5 100644
--- a/src/core/kernel/support/EmuFS.cpp
+++ b/src/core/kernel/support/EmuFS.cpp
@@ -770,6 +770,25 @@ void EmuGenerateFS(xbox::PETHREAD Ethread, unsigned Host2XbStackBaseReserved, un
 	}
 #endif
 
+	// Initialize TlsData in order to avoid xbox's APIs attempt to try access null pointer from CxbxrCreateThread.
+	// As far as I have seen, Xapi's CreateThread's startup function is the only one that does the tls' initialization.
+	// It will repeat same process yet will not cause performance impact.
+	// NOTE: PsCreateSystemThread's startup function does not do tls' initialization.
+	if (Ethread->Tcb.TlsData) {
+		Xbe::TLS* XbeTls = (Xbe::TLS*)CxbxKrnl_Xbe->m_Header.dwTLSAddr;
+		uint32_t RawTlsDataSize = XbeTls->dwDataEndAddr - XbeTls->dwDataStartAddr;
+		// First index is a pointer to the array of tls datas.
+		xbox::addr_xt* TlsData = reinterpret_cast<xbox::addr_xt*>(Ethread->Tcb.TlsData);
+		*TlsData = reinterpret_cast<xbox::addr_xt>(Ethread->Tcb.TlsData) + sizeof(xbox::addr_xt);
+		// Set the actual tls data from xbe.
+		TlsData += 1;
+		std::memcpy(TlsData, reinterpret_cast<xbox::PVOID>(XbeTls->dwDataStartAddr), RawTlsDataSize);
+
+		if (XbeTls->dwSizeofZeroFill) {
+			std::memset(reinterpret_cast<xbox::PBYTE>(TlsData) + RawTlsDataSize, 0, XbeTls->dwSizeofZeroFill);
+		}
+	}
+
 	// Initialize a fake PrcbData.CurrentThread 
 	{
 		// TODO: Do we need NtTib's overwrite in ENABLE_KTHREAD_SWITCHING usage?