diff --git a/fedot/core/data/data.py b/fedot/core/data/data.py
index 3719806f58..3b1a9a1c29 100644
--- a/fedot/core/data/data.py
+++ b/fedot/core/data/data.py
@@ -97,7 +97,7 @@ def from_numpy_time_series(cls,
                         """
         if isinstance(task, str):
             task = Task(TaskTypesEnum(task))
-        if not target_array:
+        if target_array is not None:
             target_array = features_array
         return array_to_input_data(features_array, target_array, idx, task, data_type)