diff --git a/src/bonsai/bonsai/tool/polyline.py b/src/bonsai/bonsai/tool/polyline.py
index 5a91fc79b8..542bc23005 100644
--- a/src/bonsai/bonsai/tool/polyline.py
+++ b/src/bonsai/bonsai/tool/polyline.py
@@ -533,9 +533,12 @@ class Polyline(bonsai.core.tool.Polyline):
             polyline_data = polyline_data[0]
         polyline_points = polyline_data.polyline_points
         if polyline_points:
-            # Avoids creating two points at the same location
-            for point in polyline_points[1:]:  # The first can be repeated to form a wall loop
+            # Avoids creating two points at the same location.
+            # The only exception is repeating the first point to close a loop (requires >= 3 existing points).
+            for i, point in enumerate(polyline_points):
                 if (x, y, z) == (point.x, point.y, point.z):
+                    if i == 0 and len(polyline_points) >= 3:
+                        continue
                     return "Cannot create two points at the same location"
             # Avoids creating overlapping edges
             if len(polyline_points) > 1: