diff --git a/fedot/preprocessing/preprocessing.py b/fedot/preprocessing/preprocessing.py
index 64e9720c3d..874c308280 100644
--- a/fedot/preprocessing/preprocessing.py
+++ b/fedot/preprocessing/preprocessing.py
@@ -603,8 +603,9 @@ def reduce_mem_usage_np(arr, initial_types):
                 self.log.message('-- Reduce memory in features')
                 data.features = reduce_mem_usage_np(data.features, data.supplementary_data.col_type_ids['features'])
 
-                self.log.message('-- Reduce memory in target')
-                data.target = reduce_mem_usage_np(data.target, data.supplementary_data.col_type_ids['target'])
+                if data.target is not None:
+                    self.log.message('-- Reduce memory in target')
+                    data.target = reduce_mem_usage_np(data.target, data.supplementary_data.col_type_ids['target'])
 
         return data