diff --git a/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp b/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp
index 24526071d..1742adb13 100644
--- a/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp
+++ b/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp
@@ -8685,14 +8685,15 @@ xbox::void_xt WINAPI xbox::EMUPATCH(D3DDevice_RunVertexStateShader)
 	PGRAPHState* pg = &(dev->pgraph);
 
 	float vertex_state_shader_v0[4];
-
-	for (int slot = 0; slot < 4; slot++)
-	{
-		if (pData != nullptr)
-			vertex_state_shader_v0[slot] = pData[slot];
-		else
+	if (pData != nullptr)
+		//if pData != nullptr, then it contents v0.xyzw, we shall copy the binary content directly.
+		memcpy(vertex_state_shader_v0,pData, sizeof(vertex_state_shader_v0));
+	else
+		//for pData == nullptr, this data is not supposed to be used. but we assign v0.xyzw 0.0f in each component just in case.
+		for (int slot = 0; slot < 4; slot++)
+	    {
 			vertex_state_shader_v0[slot] = 0.0f;
-	}
+    	}
 
 	int shader_slot = Address;
 	Nv2aVshProgram program;