(ports_intern_external_port): Properly add PI to CLASS's port list when the

  list is empty.

1 files changed, 2 insertions, 1 deletions

diff --git a/libports/intern-external-port.c b/libports/intern-external-port.c
index 49139e7d..c60fc87e 100644
--- a/libports/intern-external-port.c
+++ b/libports/intern-external-port.c
@@ -72,7 +72,8 @@ void *ports_intern_external_port (struct port_bucket *bucket,
   assert_perror (err);
   pi->next = class->ports;
   pi->prevp = &class->ports;
-  class->ports->prevp = &pi->next;
+  if (class->ports)
+    class->ports->prevp = &pi->next;
   class->ports = pi;
   bucket->count++;
   class->count++;