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-rw-r--r--src/build.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/build.c b/src/build.c
index f01e7c8..330f057 100644
--- a/src/build.c
+++ b/src/build.c
@@ -360,7 +360,8 @@ void exp2msg(const struct nf_expect *exp, struct nethdr *n)
exp_build_u32(exp, ATTR_EXP_NAT_DIR, n, NTA_EXP_NAT_DIR);
}
- exp_build_str(exp, ATTR_EXP_HELPER_NAME, n, NTA_EXP_HELPER_NAME);
+ if (nfexp_attr_is_set(exp, ATTR_EXP_HELPER_NAME))
+ exp_build_str(exp, ATTR_EXP_HELPER_NAME, n, NTA_EXP_HELPER_NAME);
if (nfexp_attr_is_set(exp, ATTR_EXP_FN))
exp_build_str(exp, ATTR_EXP_FN, n, NTA_EXP_FN);
}