diff --git a/monai/transforms/io/array.py b/monai/transforms/io/array.py
index cdcc4da80d..b8f8cc6ee0 100644
--- a/monai/transforms/io/array.py
+++ b/monai/transforms/io/array.py
@@ -440,7 +440,7 @@ def __init__(
         self.write_kwargs = {"verbose": print_log}
         self._data_index = 0
         self.savepath_in_metadict = savepath_in_metadict
-        if mapping_json_path:
+        if mapping_json_path is not None:
             self.mapping_json_path = Path(mapping_json_path)
             self.savepath_in_metadict = True
         else: