diff --git a/src/mngt/ocf_mngt_cache.c b/src/mngt/ocf_mngt_cache.c
index 7a112cc..476781c 100644
--- a/src/mngt/ocf_mngt_cache.c
+++ b/src/mngt/ocf_mngt_cache.c
@@ -3064,6 +3064,11 @@ void ocf_mngt_cache_attach(ocf_cache_t cache,
 	if (!cache->mngt_queue)
 		OCF_CMPL_RET(cache, priv, -OCF_ERR_INVAL);
 
+	if (ocf_cache_is_device_attached(cache)) {
+		ocf_cache_log(cache, log_err, "Cache is already attached!\n");
+		OCF_CMPL_RET(cache, priv, -OCF_ERR_INVAL);
+	}
+
 	result = _ocf_mngt_cache_validate_attach_cfg(cfg);
 	if (result)
 		OCF_CMPL_RET(cache, priv, result);
diff --git a/src/mngt/ocf_mngt_core.c b/src/mngt/ocf_mngt_core.c
index 6986e8d..2b34725 100644
--- a/src/mngt/ocf_mngt_core.c
+++ b/src/mngt/ocf_mngt_core.c
@@ -482,7 +482,8 @@ static void ocf_mngt_cache_add_core_insert(ocf_pipeline_t pipeline,
 			cfg->seq_cutoff_promote_on_threshold);
 
 	/* Add core sequence number for atomic metadata matching */
-	if (ocf_volume_is_atomic(&cache->device->volume)) {
+	if (ocf_cache_is_device_attached(cache) &&
+			ocf_volume_is_atomic(&cache->device->volume)) {
 		core_sequence_no = ocf_mngt_get_core_seq_no(cache);
 		if (core_sequence_no == OCF_SEQ_NO_INVALID)
 			OCF_PL_FINISH_RET(pipeline, -OCF_ERR_TOO_MANY_CORES);