unexpected crashes 17w15a

when I hold shift and I release the f3 button I get a unexpected crash with the error: Unreported exception thrown!
java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.elementData(ArrayList.java:418)
at java.util.ArrayList.remove(ArrayList.java:495)
at qn.b(SourceFile:70)
at bgu.aw(SourceFile:989)
at bgu.a(SourceFile:399)
at net.minecraft.client.main.Main.main(SourceFile:123)