Sodium Crash: BufferUnderflowException in MultiDrawBatch

What the log looks like

java\.nio\.BufferUnderflowException[\s\S]{0,200}me\.jellysquid\.mods\.sodium\.client\.gl\.util\.MultiDrawBatch\$UnsafeMultiDrawBatch\.add
me\.jellysquid\.mods\.sodium\.client\.gl\.util\.MultiDrawBatch\$UnsafeMultiDrawBatch\.add\(MultiDrawBatch\.java:\d+\)

How to fix it

1. Check your crash report for 'cullleaves' in the stacktrace; if you have the Cull Leaves mod installed, remove or update it, as it conflicts with Sodium's chunk draw batching.
2. Update both Sodium and Iris Shaders to the newest builds available for your Minecraft version so you have the latest chunk renderer fixes.
3. If the stacktrace mentions 'ShadowRenderer.renderShadows', lower your Shadow Distance (or Max Shadow Distance in shader pack settings) and Render Distance in Video Settings to reduce the number of shadow draw calls.
4. If the crash still occurs when exploring or flying rapidly, toggle shaders off (press 'K' by default with Iris) while traveling across unloaded chunks.

Check your own log