From ba419f907e58b5513f8a6c94778a0aec8b019787 Mon Sep 17 00:00:00 2001
From: Josh Hawkins <32435876+hawkeye217@users.noreply.github.com>
Date: Tue, 1 Jul 2025 07:40:24 -0500
Subject: [PATCH] fix potential divide by zero in misconfigured speed zones

---
 frigate/util/velocity.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/frigate/util/velocity.py b/frigate/util/velocity.py
index 207215bfb..61f1a0d94 100644
--- a/frigate/util/velocity.py
+++ b/frigate/util/velocity.py
@@ -59,6 +59,11 @@ def create_ground_plane(zone_points, distances):
         :param y: Y-coordinate in the image
         :return: Real-world distance per pixel at the given (x, y) coordinate
         """
+
+        # Return 0 if divide by zero would occur
+        if (B[0] - A[0]) == 0 or (D[1] - A[1]) == 0:
+            return 0
+
         # Normalize x and y within the zone
         x_norm = (x - A[0]) / (B[0] - A[0])
         y_norm = (y - A[1]) / (D[1] - A[1])