lib-program-client: Make sure program client callback is called only once.

diff --git a/src/lib-program-client/program-client.c b/src/lib-program-client/program-client.c
index cb5b599e53c64d85f664b08b2e80e75b954ebb9d..c3d1b3d079617bff335a0fff8e5f7e3dcbb3d57c 100644 (file)
--- a/src/lib-program-client/program-client.c
+++ b/src/lib-program-client/program-client.c
@@ -23,10 +23,11 @@ static void
 program_client_callback(struct program_client *pclient, int result,
                        void *context)
 {
-       /* do not call callback when destroying */
-       if (pclient->destroying) return;
        program_client_callback_t *callback = pclient->callback;
-       i_assert(pclient->callback != NULL);
+
+       pclient->callback = NULL;
+       if (pclient->destroying || callback == NULL)
+               return;
        callback(result, context);
 }