diff --git a/modules/map.lua b/modules/map.lua
index e47db33c..1eece674 100644
--- a/modules/map.lua
+++ b/modules/map.lua
@@ -126,10 +126,12 @@ pfUI:RegisterModule("map", "vanilla:tbc", function ()
         local scale  = WorldMapButton:GetEffectiveScale()
         local x, y   = GetCursorPosition()
 
-        mx = (( x / scale ) - ( mx - width / 2)) / width * 100
-        my = (( my + height / 2 ) - ( y / scale )) / height * 100
+        if mx and my then
+          mx = (( x / scale ) - ( mx - width / 2)) / width * 100
+          my = (( my + height / 2 ) - ( y / scale )) / height * 100
+        end
 
-        if MouseIsOver(WorldMapButton) then
+        if mx and my and MouseIsOver(WorldMapButton) then
           WorldMapButton.coords.text:SetText(string.format('%.1f / %.1f', mx, my))
         else
           WorldMapButton.coords.text:SetText("")