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-rw-r--r--macros/luatex/generic/luavlna/luavlna.lua1
1 files changed, 1 insertions, 0 deletions
diff --git a/macros/luatex/generic/luavlna/luavlna.lua b/macros/luatex/generic/luavlna/luavlna.lua
index be833905f2..f13fe6bd59 100644
--- a/macros/luatex/generic/luavlna/luavlna.lua
+++ b/macros/luatex/generic/luavlna/luavlna.lua
@@ -253,6 +253,7 @@ local function prevent_single_letter (head)
while head do
local id = head.id
local nextn = head.next
+ if nextn == nil then break end
-- local skip = node.has_attribute(head, luatexbase.attributes.preventsinglestatus)
local skip = node.has_attribute(head, M.preventsingleid)
if id == math_id then