Minecraft will crash on Multiplayer

Reported exception thrown!
f: mouseClicked event handler
at bqa.a(SourceFile:433)
at bmi.a(SourceFile:64)
at bmi$$Lambda$108/1659537713.invoke(Unknown Source)
at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:23)
at org.lwjgl.system.JNI.invokeV(Native Method)
at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:2599)
at bmq.a(SourceFile:294)
at bmg.b(SourceFile:836)
at bmg.a(SourceFile:369)
at net.minecraft.client.main.Main.main(SourceFile:134)
Caused by: java.lang.IllegalArgumentException: Non [a-z0-9_-] character in path
at mp.<init>(SourceFile:27)
at mp.<init>(SourceFile:36)
at brx.<init>(SourceFile:53)
at bry.a(SourceFile:48)
at bru.c(SourceFile:83)
at bqa.a(SourceFile:310)
at bmg.a(SourceFile:718)
at bqf$5.a(SourceFile:229)
at bnh.mouseClicked(SourceFile:102)
at boe.mouseClicked(SourceFile:44)
at bqf.mouseClicked(SourceFile:507)
at bmi.b(SourceFile:64)
at bmi$$Lambda$158/992279407.run(Unknown Source)
at bqa.a(SourceFile:428)
... 9 more