From 644b9d96cdf648c55c67f00e68024a24be39bc05 Mon Sep 17 00:00:00 2001
From: Cheng Gong <cheng.gong@it.uu.se>
Date: Thu, 26 Oct 2023 19:26:34 -0500
Subject: [PATCH] Fix make_zero on undef arrays (#1112)

---
 src/compiler.jl | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/compiler.jl b/src/compiler.jl
index 3c7961a12f..c4ab585680 100644
--- a/src/compiler.jl
+++ b/src/compiler.jl
@@ -2108,8 +2108,10 @@ end
     newa = RT(undef, size(prev))
     seen[prev] = newa
     for I in eachindex(prev)
-        pv = prev[I]
-        @inbounds newa[I] = make_zero(Core.Typeof(pv), seen, pv, Val(copy_if_inactive))
+        if isassigned(prev, I)
+            pv = prev[I]
+            @inbounds newa[I] = make_zero(Core.Typeof(pv), seen, pv, Val(copy_if_inactive))
+        end
     end
     return newa
 end