Server keeps crashing during drops

The server stays stable until the drop shows up in the screen... i get "Disconnected. You have lost connection to the server".

I think the underline cause is the mod im using... since school started i have been using a idle gift opening mob that would auto open the gifts for me. because when i tried the game without the mob, i could open the drop using a science machine. 

i didnt have this error before the new update though, i have been using this mod for on weekly basis. the mod is called idle gift opening