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-rw-r--r--macros/luatex/generic/lualibs/lualibs-io.lua2
1 files changed, 1 insertions, 1 deletions
diff --git a/macros/luatex/generic/lualibs/lualibs-io.lua b/macros/luatex/generic/lualibs/lualibs-io.lua
index fa3ad3c4cd..a955262a31 100644
--- a/macros/luatex/generic/lualibs/lualibs-io.lua
+++ b/macros/luatex/generic/lualibs/lualibs-io.lua
@@ -13,7 +13,7 @@ local concat = table.concat
----- floor = math.floor
local type = type
-if string.find(os.getenv("PATH"),";",1,true) then
+if string.find(os.getenv("PATH") or "",";",1,true) then
io.fileseparator, io.pathseparator = "\\", ";"
else
io.fileseparator, io.pathseparator = "/" , ":"