[BUG] Is ItemsAdder Item Condition can't use is not

[killertuling]

Describe the bug
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To Reproduce
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It will work：

but It produces errors

Expected behavior
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Screenshots
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Server Version (/version):

• 1.20.4

Skript and skript-itemadder version:

• Skript: 2.8.4
• skript-itemsadder: 1.4.1

Additional context
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[Asleeepp]

Will be fixed in the next update 👍