diff --git a/forgebox/__init__.py b/forgebox/__init__.py
index 3926618..d9ef2ea 100644
--- a/forgebox/__init__.py
+++ b/forgebox/__init__.py
@@ -1 +1 @@
-__version__ = "0.4.18.3"
+__version__ = "0.4.18.4"
diff --git a/forgebox/multiproc.py b/forgebox/multiproc.py
index e48b74a..d3353c9 100644
--- a/forgebox/multiproc.py
+++ b/forgebox/multiproc.py
@@ -131,11 +131,11 @@ def __iter__(self):
 
     def __getitem__(self, idx):
         global DataFrameRowling_df
-        return DataFrameRowling_df[list(DataFrameRowling_df.index[idx]]
+        return DataFrameRowling_df[list(DataFrameRowling_df.index)[idx]]
 
     def __next__(self):
         global DataFrameRowling_df
         global DataFrameRowling_ct
-        row = DataFrameRowling_df.loc[DataFrameRowling_df.index[DataFrameRowling_ct]]
+        row = DataFrameRowling_df.loc[list(DataFrameRowling_df.index)[DataFrameRowling_ct]]
         DataFrameRowling_ct+=1
         return row
\ No newline at end of file
diff --git a/nbs/09_multiprocess.ipynb b/nbs/09_multiprocess.ipynb
index 117a37a..7a0c8fe 100644
--- a/nbs/09_multiprocess.ipynb
+++ b/nbs/09_multiprocess.ipynb
@@ -173,7 +173,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 60,
+   "execution_count": 64,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -209,7 +209,7 @@
     "    def __next__(self):\n",
     "        global DataFrameRowling_df\n",
     "        global DataFrameRowling_ct\n",
-    "        row = DataFrameRowling_df.loc[DataFrameRowling_df.index[DataFrameRowling_ct]]\n",
+    "        row = DataFrameRowling_df.loc[list(DataFrameRowling_df.index)[DataFrameRowling_ct]]\n",
     "        DataFrameRowling_ct+=1\n",
     "        return row"
    ]
diff --git a/settings.ini b/settings.ini
index 123762d..bd46678 100644
--- a/settings.ini
+++ b/settings.ini
@@ -7,7 +7,7 @@ author = xiaochen(ray) zhang
 author_email = b2ray2c@gmail.com
 copyright = xiaochen(ray) zhang
 branch = master
-version = 0.4.18.3
+version = 0.4.18.4
 min_python = 3.6
 audience = Developers
 language = English