NPE when using loop-value in a date list

[Whimsyturtle]

Description

When having a date list, and looping through the date list and getting the difference between now and loop-value, an NPE will occur upon skript parse.

Steps to Reproduce

command /test:
    trigger:
        loop {list::*}:
            send "%difference between now and loop-value%"

Expected Behavior

For an NPE to not be thrown on skript parse

Errors / Screenshots

https://pastebin.com/HqprGYjk

Server Information

• Server version/platform: Spigot 1.14.4
• Skript version: Skript 2.4-beta3

Additional Context

[TPGamesNL]

AFAIK this occurs when one of the 2 expressions has Object as their return type (not as a variable), such as:
set {_x} to difference between (metadata "test" of player) and (metadata "test" of player)
or
set {_x} to difference between 1 and loop-value