diff --git a/activitysim/abm/tables/skims.py b/activitysim/abm/tables/skims.py
index 6cb20edc6e..3a2245278c 100644
--- a/activitysim/abm/tables/skims.py
+++ b/activitysim/abm/tables/skims.py
@@ -149,7 +149,7 @@ def block_name(block):
 def buffers_for_skims(skim_info, shared=False):
 
     skim_dtype = skim_info['dtype']
-    omx_shape = skim_info['omx_shape']
+    omx_shape = [np.float64(x) for x in skim_info['omx_shape']]
     blocks = skim_info['blocks']
 
     skim_buffers = {}
diff --git a/activitysim/core/inject.py b/activitysim/core/inject.py
index d4975d14b0..6e97d2c12e 100644
--- a/activitysim/core/inject.py
+++ b/activitysim/core/inject.py
@@ -84,9 +84,12 @@ def add_step(name, func):
     return orca.add_step(name, func)
 
 
-def add_table(table_name, table):
-
-    if orca.is_table(table_name) and orca.table_type(table_name) == 'dataframe':
+def add_table(table_name, table, replace=False):
+    """
+    Add new table and raise assertion error if the table already exists.
+    Silently replace if replace=True.
+    """
+    if not replace and orca.is_table(table_name) and orca.table_type(table_name) == 'dataframe':
         logger.warning("inject add_table replacing existing table %s" % table_name)
         assert False
 
diff --git a/setup.py b/setup.py
index 2e96d4ee05..f616a4ddc4 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setup(
     name='activitysim',
-    version='0.9',
+    version='0.9.1',
     description='Activity-Based Travel Modeling',
     author='contributing authors',
     author_email='ben.stabler@rsginc.com',