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-rw-r--r--nest/iface.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/nest/iface.c b/nest/iface.c
index 9c884a0..5255cff 100644
--- a/nest/iface.c
+++ b/nest/iface.c
@@ -578,7 +578,8 @@ iface_patts_equal(list *a, list *b, int (*comp)(struct iface_patt *, struct ifac
y = HEAD(*b);
while (x->n.next && y->n.next)
{
- if (strcmp(x->pattern, y->pattern) ||
+ if ((!(x->pattern==NULL)&&(x->pattern==NULL) &&
+ strcmp(x->pattern, y->pattern)) ||
!ipa_equal(x->prefix, y->prefix) ||
x->pxlen != y->pxlen ||
comp && !comp(x, y))