This was just posted on the Minecraft Forums.

No other mods besides this one were showing up in the stacktrace, so I thought I'd file an issue here.

looks like an old version of Psi. The bug is fixed in later versions.

Oki, sorry to bother you then!

This is the latest build for Minecraft 1.8.9 though, so don't you support that version anymore?

I think 1.9 is the only supported version at this point.
On Fri, Apr 1, 2016 at 7:22 AM Mathijs Riezebos [email protected]
wrote:

This is the latest build for Minecraft 1.8.9 though, so don't you support
that version anymore?

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#163 (comment)

But why? Forge for 1.9 isn't even stable yet!

Well, first of all, psi is only in beta, so not fully stable yet either, also, just because something isn't stable yet, doesn't mean we can't say "we'll not support older versions of this mod"

And because this mod is beta, it would be very practical to develop it on the version where its greatest player base is situated, because the version has quite some other mods as well. a.k.a. MC 1.8.9

I'm not telling you what you can and can't say or do. I'm just arguing what would be wise to say and do. Do with my argument(s) whatever you want.