Describe the bug
I was changing the settings as I usually do, when the shader suddenly failed to load? I couldnt even get back into the settings to reset this.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'PBR in shader pack settings'
2. Go to 'Lava Material Settings'
3. Turn off Lava Noise
4. Error appeared for me.
   Expected behavior
   I expected it to just work like normal settings. I've never had this issue with this shader before.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• GPU: Intel(R) UHD Graphics
• Shader loader: Iris 1.9.1 (Possibly outdated? it says its for 1.21.7, but i've been using it fine for days.)
• Shader version: 1.3.8 for 1.21.8 + 21

Additional context

Error code copied: terrain_solid: terrain_solid: ERROR: 0:602: 'fragmentFrameTime' : undeclared identifier

Fixed in 1.3.9, will close this post once 1.3.9 is released.