added check for nil

Signed-off-by: Ebbe Baß <ebbe.bass>

MA3 OSC FEEDBACK.lua

@@ -60,13 +60,16 @@ local function poll(exec_no)
     local execAssObj = execAssObjNoClass:GetClass()
     local colors = color_map[execAssObj] or {0, 0, 0} -- fallback colors
     
-    -- Appearance-based color override
+    -- Check if assObjApp exists before using gsub
     local assObjApp = execAssObjNoClass:Get("Appearance")
     if assObjApp then
-      local app_id = tonumber(assObjApp:gsub("Appearance ", ""))
+      -- Make sure assObjApp is valid and then remove "Appearance " prefix
+      local app_id = tonumber(tostring(assObjApp):gsub("Appearance ", ""))
+      if app_id and ShowData().Appearances[app_id] then
         local app_data = ShowData().Appearances[app_id]
         colors = {tonumber(app_data.BackR), tonumber(app_data.BackG), tonumber(app_data.BackB)}
       end
+    end
 
     -- Send colors through OSC
     send_osc("ExecCol_R", exec_no, colors[1])