My PC crashes when i click on "Alts" button on Impact Client, anyone knows the solution?

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 5/23/22 7:22 AM
Description: mouseClicked event handler

java.lang.NullPointerException: mouseClicked event handler
    at net.impactclient.34V.2(34V.java:15)
    at net.impactclient.34P.b(34P.java:24)
    at dot.b(SourceFile:325)
    at djz.a(SourceFile:922)
    at net.impactclient.2T.8(2T.java:46)
    at net.impactclient.2T$$Lambda$3632/1642244192.onPress(Unknown Source)
    at dlj.b(SourceFile:33)
    at dld.a(SourceFile:16)
    at dlh.a(SourceFile:149)
    at dmh.a(SourceFile:27)
    at dka.b(SourceFile:92)
    at dka$$Lambda$3621/25741263.run(Unknown Source)
    at dot.a(SourceFile:435)
    at dka.a(SourceFile:92)
    at dka.c(SourceFile:162)
    at dka$$Lambda$3620/764692091.run(Unknown Source)
    at aob.execute(ThreadTaskExecutor.java:104)
    at dka.b(SourceFile:162)
    at dka$$Lambda$2354/1214025054.invoke(Unknown Source)
    at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36)
    at org.lwjgl.system.JNI.invokeV(Native Method)
    at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174)
    at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127)
    at djz.e(SourceFile:1071)
    at djz.e(SourceFile:681)
    at net.minecraft.client.main.Main.main(SourceFile:215)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:159)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:30)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Render thread
Stacktrace:
    at net.impactclient.34V.2(34V.java:15)
    at net.impactclient.34P.b(34P.java:24)
    at dot.b(SourceFile:325)
    at djz.a(SourceFile:922)
    at net.impactclient.2T.8(2T.java:46)
    at net.impactclient.2T$$Lambda$3632/1642244192.onPress(Unknown Source)
    at dlj.b(SourceFile:33)
    at dld.a(SourceFile:16)
    at dlh.a(SourceFile:149)
    at dmh.a(SourceFile:27)
    at dka.b(SourceFile:92)
    at dka$$Lambda$3621/25741263.run(Unknown Source)

-- Affected screen --
Details:
    Screen name: net.impactclient.2T
Stacktrace:
    at dot.a(SourceFile:435)
    at dka.a(SourceFile:92)
    at dka.c(SourceFile:162)
    at dka$$Lambda$3620/764692091.run(Unknown Source)
    at aob.execute(ThreadTaskExecutor.java:104)
    at dka.b(SourceFile:162)
    at dka$$Lambda$2354/1214025054.invoke(Unknown Source)
    at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36)
    at org.lwjgl.system.JNI.invokeV(Native Method)
    at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174)
    at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127)
    at djz.e(SourceFile:1071)
    at djz.e(SourceFile:681)
    at net.minecraft.client.main.Main.main(SourceFile:215)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:159)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:30)

-- System Details --
Details:
    Minecraft Version: 1.16.5
    Minecraft Version ID: 1.16.5
    Operating System: Windows 8 (amd64) version 6.2
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 2105089736 bytes (2007 MB) / 3892314112 bytes (3712 MB) up to 4294967296 bytes (4096 MB)
    CPUs: 4
    JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx4G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
    Launched Version: 1.16.5-Impact_4.9.1-OptiFine_HD_U_G6
    Backend library: LWJGL version 3.2.2 build 10
    Backend API: Intel(R) HD Graphics 2000 GL version 3.1.0 - Build 9.17.10.4459, Intel
    GL Caps: Using framebuffer using OpenGL 3.0
    Using VBOs: Yes
    Is Modded: Very likely; Jar signature invalidated
    Type: Client (map_client.txt)
    Graphics mode: fancy
    Resource Packs: 
    Current Language: English (US)
    CPU: 4x Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz
    OptiFine Version: OptiFine_1.16.5_HD_U_G6
    OptiFine Build: 20210117-013236
    Render Distance Chunks: 16
    Mipmaps: 4
    Anisotropic Filtering: 1
    Antialiasing: 0
    Multitexture: false
    Shaders: null
    OpenGlVersion: 3.1.0 - Build 9.17.10.4459
    OpenGlRenderer: Intel(R) HD Graphics 2000
    OpenGlVendor: Intel
    CpuCount: 4

The exit code i got:

The game crashed whilst mouseclicked event handler Error: java.lang.NullPointerException: mouseClicked event handler Exit Code: -1