diff --git a/src/bonsai/bonsai/tool/polyline.py b/src/bonsai/bonsai/tool/polyline.py
index 789afb10cf..f5011a935b 100644
--- a/src/bonsai/bonsai/tool/polyline.py
+++ b/src/bonsai/bonsai/tool/polyline.py
@@ -283,6 +283,7 @@ class Polyline(bonsai.core.tool.Polyline):
         vertices = []
         polyline_data = context.scene.BIMPolylineProperties.polyline_point
         if len(polyline_data) < 2:
+            context.scene.BIMPolylineProperties.product_preview.clear()
             return
         for point in polyline_data:
             vertices.append(