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java.lang.RuntimeException: Mixin transformation of net.minecraft.class_4014 failed

at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:252) at net.fabricmc.loader.impl.launch.knot ...
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java.lang.NullPointerException: Cannot invoke "java.awt.Font.deriveFont(int, float)" because "this.font" is null

The error will lag my Minecraft for about 10 seconds, it will say application not responce. [14:21:53] [Thread-22/ERROR]: java.lang.NullPointerException: Cannot ...