diff --git a/pipewire-jack/src/pipewire-jack.c b/pipewire-jack/src/pipewire-jack.c
index 98eede7de..a2ddd60ba 100644
--- a/pipewire-jack/src/pipewire-jack.c
+++ b/pipewire-jack/src/pipewire-jack.c
@@ -1144,6 +1144,8 @@ static void complete_process(struct client *c, uint32_t frames)
                 if (pw_map_item_is_free(item))
 			continue;
 		p = item->data;
+		if (!p->valid)
+			continue;
 		spa_list_for_each(mix, &p->mix, port_link) {
 			if (SPA_LIKELY(mix->io != NULL))
 				mix->io->status = SPA_STATUS_NEED_DATA;
@@ -1153,6 +1155,8 @@ static void complete_process(struct client *c, uint32_t frames)
                 if (pw_map_item_is_free(item))
 			continue;
 		p = item->data;
+		if (!p->valid)
+			continue;
 		prepare_output(p, frames);
 		p->io.status = SPA_STATUS_NEED_DATA;
 	}