diff --git a/src/mngt/ocf_mngt_io_class.c b/src/mngt/ocf_mngt_io_class.c
index 481c061..003931b 100644
--- a/src/mngt/ocf_mngt_io_class.c
+++ b/src/mngt/ocf_mngt_io_class.c
@@ -31,6 +31,8 @@ int ocf_mngt_add_partition_to_cache(struct ocf_cache *cache,
 		uint32_t max_size, uint8_t priority, bool valid)
 {
 	uint32_t size;
+	struct ocf_lst_entry *iter;
+	uint32_t iter_id;
 
 	if (!name)
 		return -OCF_ERR_INVAL;
@@ -51,6 +53,14 @@ int ocf_mngt_add_partition_to_cache(struct ocf_cache *cache,
 		return -OCF_ERR_INVAL;
 	}
 
+	for_each_lst(&cache->lst_part, iter, iter_id) {
+		if (iter_id == part_id) {
+			ocf_cache_log(cache, log_err,
+					"Part with id %hu already exists\n", part_id);
+			return -OCF_ERR_INVAL;
+		}
+	}
+
 	size = sizeof(cache->user_parts[part_id].config->name);
 	if (env_strncpy(cache->user_parts[part_id].config->name, size, name, size))
 		return -OCF_ERR_INVAL;