Crash when deleting last library you have

[JustLetterV]

Minecraft 1.19.2
Fabric loader 0.14.9
Mod version 1.1.0+1.19.2
Fabric API 0.60.0+1.19.2

java.lang.NullPointerException: Cannot invoke "com.minenash.creative_library.library.Library.getItems()" because the return value of "com.minenash.creative_library.library.LibrarySet.getMain()" is null
	at net.minecraft.client.gui.screen.ingame.CreativeInventoryScreen.redirect$zij000$creativeLibrary$getItems_dev(CreativeInventoryScreen.java:1547)
	at net.minecraft.client.gui.screen.ingame.CreativeInventoryScreen.setSelectedTab(CreativeInventoryScreen.java:553)
	at net.minecraft.client.gui.screen.ingame.CreativeInventoryScreen.init(CreativeInventoryScreen.java:340)
	at net.minecraft.client.gui.screen.Screen.clearAndInit(Screen.java:389)
	at net.minecraft.client.gui.screen.Screen.init(Screen.java:380)
	at net.minecraft.client.MinecraftClient.setScreen(MinecraftClient.java:1035)
	at com.minenash.creative_library.screens.ConfirmLibraryDeleteScreen.lambda$init$1(ConfirmLibraryDeleteScreen.java:40)
	at net.minecraft.client.gui.widget.ButtonWidget.onPress(ButtonWidget.java:43)
	at net.minecraft.client.gui.widget.PressableWidget.onClick(PressableWidget.java:16)
	at net.minecraft.client.gui.widget.ClickableWidget.mouseClicked(ClickableWidget.java:120)
	at net.minecraft.client.gui.ParentElement.mouseClicked(ParentElement.java:27)
	at net.minecraft.client.Mouse.method_1611(Mouse.java:94)
	at net.minecraft.client.gui.screen.Screen.wrapScreenError(Screen.java:489)
	at net.minecraft.client.Mouse.onMouseButton(Mouse.java:94)
	at net.minecraft.client.Mouse.method_22686(Mouse.java:165)
	at net.minecraft.util.thread.ThreadExecutor.execute(ThreadExecutor.java:103)
	at net.minecraft.client.Mouse.method_22684(Mouse.java:165)
	at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:43)
	at org.lwjgl.system.JNI.invokeV(Native Method)
	at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3474)
	at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(RenderSystem.java:222)
	at net.minecraft.client.MinecraftClient.render(MinecraftClient.java:1208)
	at net.minecraft.client.MinecraftClient.run(MinecraftClient.java:768)
	at net.minecraft.client.main.Main.main(Main.java:244)
	at net.minecraft.client.main.Main.main(Main.java:51)
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:461)
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
	at net.fabricmc.devlaunchinjector.Main.main(Main.java:86)