diff --git a/mzarr/__init__.py b/mzarr/__init__.py
index dace05b..034f46c 100644
--- a/mzarr/__init__.py
+++ b/mzarr/__init__.py
@@ -1,7 +1 @@
-__version__ = "0.0.5"
-
-import numcodecs
-from imagecodecs.numcodecs import JpegXl
-from mzarr.mzarr import Mzarr
-
-numcodecs.register_codec(JpegXl)
+__version__ = "0.0.6"
diff --git a/mzarr/mzarr.py b/mzarr/mzarr.py
index 404e2a6..8533bd6 100644
--- a/mzarr/mzarr.py
+++ b/mzarr/mzarr.py
@@ -5,8 +5,11 @@
 from imagecodecs.numcodecs import JpegXl
 from typing import Optional, List, Union, Literal, Any
 import os
+import numcodecs
 
 
+numcodecs.register_codec(JpegXl)
+
 class Mzarr:
     def __init__(self, store: Union[np.ndarray, str], mode: Literal['r', 'r+', 'a', 'w', 'w-'] = 'a') -> None:
         """
@@ -32,7 +35,10 @@ def __init__(self, store: Union[np.ndarray, str], mode: Literal['r', 'r+', 'a',
         if isinstance(store, str):
             self.load(store, mode)
         else:
-            self.array = store
+            if store.dtype in [np.uint8, np.uint16, np.float16, np.float32]:
+                self.array = store
+            else:
+                raise RuntimeError("Currently only the dtypes 'uint8', 'uint16', 'float16', 'float32' are supported. Dtype {} is not supported".format(store.dtype))
 
     def load(self, path: str, mode: Literal['r', 'r+', 'a', 'a'] = 'a') -> None:
         """
diff --git a/mzarr/nifti2mzarr.py b/mzarr/nifti2mzarr.py
index 44625da..d1a8155 100644
--- a/mzarr/nifti2mzarr.py
+++ b/mzarr/nifti2mzarr.py
@@ -4,7 +4,7 @@
 import os
 from natsort import natsorted
 import SimpleITK as sitk
-from mzarr.mzarr import Mzarr
+from mzarr import Mzarr
 import numpy as np
 from typing import Union, Tuple
 
diff --git a/mzarr/tiff2mzarr.py b/mzarr/tiff2mzarr.py
index b726e0f..e0de673 100644
--- a/mzarr/tiff2mzarr.py
+++ b/mzarr/tiff2mzarr.py
@@ -4,7 +4,7 @@
 from os.path import join
 from natsort import natsorted
 import tifffile
-from mzarr.mzarr import Mzarr
+from mzarr import Mzarr
 import numpy as np