virtual: Added assert.

--HG--
branch : HEAD

diff --git a/src/plugins/virtual/virtual-storage.c b/src/plugins/virtual/virtual-storage.c
index 76c3e7ddac746dc33d15b036ec9e5bddb5a86e1d..3575c090f8af8ee1d7bf7c93601f99d36ce5548c 100644 (file)
--- a/src/plugins/virtual/virtual-storage.c
+++ b/src/plugins/virtual/virtual-storage.c
@@ -167,6 +167,8 @@ static int virtual_backend_box_open(struct virtual_mailbox *mbox,
        struct mail_namespace *ns;
        const char *mailbox;
 
+       i_assert(bbox->box == NULL);
+
        flags |= MAILBOX_FLAG_KEEP_RECENT;
 
        mailbox = bbox->name;