diff --git a/ckanext/data_qld/converters.py b/ckanext/data_qld/converters.py
index 402f0a5a..79a53f66 100644
--- a/ckanext/data_qld/converters.py
+++ b/ckanext/data_qld/converters.py
@@ -12,6 +12,8 @@ def filesize_converter(value, context):
     :rtype: int
 
     """
+    if not value:
+        return None
     value = str(value)
     # remove whitespaces
     value = re.sub(' ', '', value)
diff --git a/ckanext/data_qld/tests/test_converters.py b/ckanext/data_qld/tests/test_converters.py
index aa53c6b8..e2d1d491 100644
--- a/ckanext/data_qld/tests/test_converters.py
+++ b/ckanext/data_qld/tests/test_converters.py
@@ -14,6 +14,8 @@ def test_filesize_converter():
                   '2 kb': 2048,
                   1024: 1024,
                   '1024, ': 1024,
+                  '1,000 bytes': 1000,
+                  '1,000 MB': 1048576000,
                   }
     for key, value in six.iteritems(test_cases):
         assert value == filesize_converter(key, {})