Guard for an odd error when a waypoint's angle can't be determined

diff --git a/TomTom_Waypoints.lua b/TomTom_Waypoints.lua
index 2e777f1..2904f54 100644
--- a/TomTom_Waypoints.lua
+++ b/TomTom_Waypoints.lua
@@ -72,6 +72,7 @@ local rad_135 = math.rad(135)

 local function rotateArrow(self)
 	local angle = Astrolabe:GetDirectionToIcon(self)
+	if not angle then return self:Hide() end
 	angle = angle + rad_135

 	if GetCVar("rotateMinimap") == "1" then