diff --git a/camelot/core.py b/camelot/core.py
index f11fcc1..ac63e54 100644
--- a/camelot/core.py
+++ b/camelot/core.py
@@ -448,7 +448,7 @@ class Table(object):
                         self.cells[L][J].top = True
                         J += 1
             elif i == []:  # only bottom edge
-                I = len(self.rows) - 1
+                L = len(self.rows) - 1
                 if k:
                     K = k[0]
                     while J < K:
diff --git a/tests/files/baseline_plots/test_grid_plot.png b/tests/files/baseline_plots/test_grid_plot.png
index d60f69f..4487eb3 100644
Binary files a/tests/files/baseline_plots/test_grid_plot.png and b/tests/files/baseline_plots/test_grid_plot.png differ