diff --git a/ch18/ch18.ipynb b/ch18/ch18.ipynb
index cfb34307..42b02c52 100644
--- a/ch18/ch18.ipynb
+++ b/ch18/ch18.ipynb
@@ -569,8 +569,7 @@
     "\n",
     "        # Agent --> square or robot\n",
     "        if (os.path.exists('robot-coordinates.pkl') and CELL_SIZE == 100):\n",
-    "            agent_coord\n",
-    "            s = pickle.load(\n",
+    "            agent_coords = pickle.load(\n",
     "                open('robot-coordinates.pkl', 'rb'))\n",
     "            starting_coords = get_coords(0, 0, loc='center')\n",
     "            agent_coords += np.array(starting_coords)\n",
@@ -1203,9 +1202,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.7.1"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }
diff --git a/ch18/gridworld/gridworld_env.py b/ch18/gridworld/gridworld_env.py
index a48ea781..33db2e98 100644
--- a/ch18/gridworld/gridworld_env.py
+++ b/ch18/gridworld/gridworld_env.py
@@ -180,8 +180,7 @@ def _build_display(self, gold_cell, trap_cells):
 
         # Agent --> square or robot
         if (os.path.exists('robot-coordinates.pkl') and CELL_SIZE == 100):
-            agent_coord
-            s = pickle.load(
+            agent_coords = pickle.load(
                 open('robot-coordinates.pkl', 'rb'))
             starting_coords = get_coords(0, 0, loc='center')
             agent_coords += np.array(starting_coords)