java.lang.StringIndexOutOfBoundsException: String index out of range: -10

[Jesse205]

FATAL EXCEPTION: main
Process: com.f0x1d.logfox, PID: 31044
java.lang.StringIndexOutOfBoundsException: String index out of range: -10
	at java.lang.String.substring(String.java:2064)
	at P3.a.l(SourceFile:38)
	at Q3.b.k(SourceFile:111)
	at Q3.b.f(SourceFile:5)
	at r4.f.k(SourceFile:147)
	at v6.a.n(SourceFile:9)
	at S6.G.run(SourceFile:113)
	at Z6.a.run(SourceFile:96)
	Suppressed: X6.g: [t0{Cancelling}@b1d378a, Dispatchers.Main.immediate]

There is no recurrence step, and it suddenly crashes.