diff --git a/src/value.zig b/src/value.zig
index 502de64348384e87dbbbb37cc780fff22eaf3b1e..7c5401cd75a47cc11e43bd1fc5db5f8401ab6e58 100644
--- a/src/value.zig
+++ b/src/value.zig
@@ -2336,6 +2336,8 @@ pub const Value = extern union {
         buffer: *ElemValueBuffer,
     ) error{OutOfMemory}!Value {
         switch (val.tag()) {
+            // This is the case of accessing an element of an undef array.
+            .undef => return Value.undef,
             .empty_array => unreachable, // out of bounds array index
             .empty_struct_value => unreachable, // out of bounds array index