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-rw-r--r--src/gen_mod.erl2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/gen_mod.erl b/src/gen_mod.erl
index 6575e1e82..cf107f7b0 100644
--- a/src/gen_mod.erl
+++ b/src/gen_mod.erl
@@ -620,7 +620,7 @@ validate_opt(Opt, Val, VFun) ->
NewVal -> [{Opt, NewVal}]
catch {invalid_syntax, Error} ->
err_invalid_option(Opt, Val, Error);
- _:_ ->
+ _:R when R /= undef ->
err_invalid_option(Opt, Val)
end.