Bones and IK Step 8 AttributeError: 'NoneType' object has no attribute 'head'

[Nextien]

I'm trying to convert an FFXIV Model to MMD model but when I reach the Bones and IK and hit "Run Steps 1 to 12", I keep getting this error. I went through each step one-by-one and I always get it on "8 - Add Eyes Control Bone". Every other step runs fine, including the other steps that add special bones like "9 - Add Arm Twist Bones"

add_eye_control_bone():
Traceback (most recent call last):
  File "C:\Users\[User]\AppData\Roaming\Blender Foundation\Blender\3.6\scripts\addons\ffxiv_mmd_tools_helper\bone_conversion.py", line 1100, in execute
    main(context)
  File "C:\Users\[User]\AppData\Roaming\Blender Foundation\Blender\3.6\scripts\addons\ffxiv_mmd_tools_helper\bone_conversion.py", line 1037, in main
    add_eye_control_bone(armature,bone_type)
  File "C:\Users\[User]\AppData\Roaming\Blender Foundation\Blender\3.6\scripts\addons\ffxiv_mmd_tools_helper\bone_conversion.py", line 452, in add_eye_control_bone
    eyes_bone.head = 0.5 * (eye_L_bone.head + eye_R_bone.head)
AttributeError: 'NoneType' object has no attribute 'head'
Error: Python: Traceback (most recent call last):
  File "C:\Users\[User]\AppData\Roaming\Blender Foundation\Blender\3.6\scripts\addons\ffxiv_mmd_tools_helper\bone_conversion.py", line 1100, in execute
    main(context)
  File "C:\Users\[User]\AppData\Roaming\Blender Foundation\Blender\3.6\scripts\addons\ffxiv_mmd_tools_helper\bone_conversion.py", line 1037, in main
    add_eye_control_bone(armature,bone_type)
  File "C:\Users\[User]\AppData\Roaming\Blender Foundation\Blender\3.6\scripts\addons\ffxiv_mmd_tools_helper\bone_conversion.py", line 452, in add_eye_control_bone
    eyes_bone.head = 0.5 * (eye_L_bone.head + eye_R_bone.head)
AttributeError: 'NoneType' object has no attribute 'head'