From bdf3f34e6bbb55eb2a040a46f8b340bbd89def67 Mon Sep 17 00:00:00 2001
From: justuswolff <justus@das-wolff-rudel.de>
Date: Thu, 19 Feb 2026 20:12:03 +0100
Subject: [PATCH] failcheck

---
 src/main.lua | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main.lua b/src/main.lua
index f1ffaf7..79f16e2 100644
--- a/src/main.lua
+++ b/src/main.lua
@@ -647,6 +647,9 @@ local function VP_createstack(buf, dimensions)
 end
 local function VP_splitstack(_stack, x)
     local stack = _stack["stacks"]
+    if #stack == 0 then
+        error("Internal error, splitstack received 0 stacks. There is nothing to split.")
+    end
     local dimensions = _stack["dimensions"]
     local sx = dimensions["sx"]
     local sz = dimensions["sz"]