diff --git a/figures/beacon/src/beacon_field.py b/figures/beacon/src/beacon_field.py
index d09c7ed..523bbc1 100755
--- a/figures/beacon/src/beacon_field.py
+++ b/figures/beacon/src/beacon_field.py
@@ -53,6 +53,9 @@ def grid_plot(grid, ax=None, **plot_kwargs):
     if ax is None:
         ax = plt.gca()
 
+    if not grid:
+        return
+
     x = [a.x for a in grid]
     y = [a.y for a in grid]
     l = [a.name for a in grid]
@@ -127,7 +130,9 @@ def plot_field(
 
     scatter_kwargs = {**default_scatter_kwargs, **scatter_kwargs}
 
-    grid_plot([tx] + ants, ax=ax)
+    if tx or ants:
+        grid_plot([tx] + ants, ax=ax)
+
     if ref_ant is not None:
         ax.set_title("Single baseline\n reference antenna={}, f={}MHz".format(ref_ant.name, f_beacon/1e6))
     else: