diff --git a/src/core/NavigationOverlayHandler.ttslua b/src/core/NavigationOverlayHandler.ttslua
index ad8f37d4..cf5084aa 100644
--- a/src/core/NavigationOverlayHandler.ttslua
+++ b/src/core/NavigationOverlayHandler.ttslua
@@ -1,3 +1,4 @@
+local guidReferenceApi = require("core/GUIDReferenceApi")
 local playermatApi = require("playermat/PlayermatApi")
 
 fullButtonData   = {
@@ -185,7 +186,6 @@ end
 
 -- XML button creation
 function createXmlButtonHelper(ui, params)
-  local guid = self.getGUID()
   local xml = findTagWithId(ui, params.id)
 
   -- add basic image
@@ -202,7 +202,7 @@ function createXmlButtonHelper(ui, params)
     table.insert(xml.children, {
       tag = "button",
       attributes = {
-        onClick  = guid .. "/buttonClicked",
+        onClick  = self.getGUID() .. "/buttonClicked",
         id       = d.id,
         height   = d.height,
         width    = d.width,
@@ -311,10 +311,18 @@ function loadCamera(player, camera)
     matColor = camera
   end
 
+  -- if mat is removed, end here
+  local mat = guidReferenceApi.getObjectByOwnerAndType(matColor, "Playermat")
+  if mat == nil then
+    printToColor("This playermat seems to be removed.", player.color)
+    return
+  end
+
   -- dynamic view of the play area
   if index == 2 then
     -- search the scripting zone on the play area for objects
-    local bounds = getDynamicViewBounds(getObjectFromGUID("a2f932").getObjects())
+    local zone = guidReferenceApi.getObjectByOwnerAndType("Mythos", "PlayAreaZone")
+    local bounds = getDynamicViewBounds(zone.getObjects())
 
     lookHere = {
       position = { bounds.middleX, 1.55, bounds.middleZ },