diff --git a/lua/Cheat Engine/Supermarket.lua b/lua/Cheat Engine/Supermarket.lua
index c6c1e04..d18fd51 100644
--- a/lua/Cheat Engine/Supermarket.lua	
+++ b/lua/Cheat Engine/Supermarket.lua	
@@ -62,6 +62,8 @@ end
     mono class wrappers
 ]]
 function MonoArray(addr)
+    if not addr or addr == 0 then error("attempted to instantiate MonoArray with invalid addr") end
+
     local classId, className = mono_object_getClass(addr)
     if not className then error("address did not point to valid object") end
     if className:sub(-2) ~= "[]" then error("address did not point to array") end