switch (hdr->opcode) {
        case DATA_CMD_RSP_WR_SH_MEM_EP_DATA_BUFFER_DONE_V2:
+               if (!graph->ar_graph)
+                       break;
                client_event = APM_CLIENT_EVENT_DATA_WRITE_DONE;
                mutex_lock(&graph->lock);
                token = hdr->token & APM_WRITE_TOKEN_MASK;
                wake_up(&graph->cmd_wait);
                break;
        case DATA_CMD_RSP_RD_SH_MEM_EP_DATA_BUFFER_V2:
+               if (!graph->ar_graph)
+                       break;
                client_event = APM_CLIENT_EVENT_DATA_READ_DONE;
                mutex_lock(&graph->lock);
                rd_done = data->payload;
 {
        struct audioreach_graph *ar_graph = graph->ar_graph;
 
-       gpr_free_port(graph->port);
+       graph->ar_graph = NULL;
        kref_put(&ar_graph->refcount, q6apm_put_audioreach_graph);
+       gpr_free_port(graph->port);
        kfree(graph);
 
        return 0;