fatal error: concurrent map read and map write

[qq345340585]

fatal error: concurrent map read and map write

goroutine 133 [running]:
runtime.throw(0x116d55e, 0x21)
C:/Go/src/runtime/panic.go:1116 +0x79 fp=0xc00086de90 sp=0xc00086de60 pc=0x43b579
runtime.mapaccess1_faststr(0xfd4100, 0xc00063f110, 0xc0007a35b8, 0x4, 0x0)
C:/Go/src/runtime/map_faststr.go:21 +0x465 fp=0xc00086df00 sp=0xc00086de90 pc=0x414d65
github.com/scottkiss/grtm.(*GrManager).NewLoopGoroutine.func1(0xc0007a35b8, 0x4, 0xc00038e0b0, 0xc0007a35b8, 0x4, 0xf7b740, 0xc000791480, 0x0, 0x0, 0x0)
C:/Users/Administrator/go/pkg/mod/github.com/scottkiss/[email protected]/grmanager.go:38 +0xaf fp=0xc00086df90 sp=0xc00086df00 pc=0xcfc06f
runtime.goexit()
C:/Go/src/runtime/asm_amd64.s:1374 +0x1 fp=0xc00086df98 sp=0xc00086df90 pc=0x4706e1
created by github.com/scottkiss/grtm.(*GrManager).NewLoopGoroutine
C:/Users/Administrator/go/pkg/mod/github.com/scottkiss/[email protected]/grmanager.go:30 +0xac