Coin garbage collector crashes

vmbuilder@vmbuilder:~/qt-ci$ bin/coin gc
Collecting tasks...
Scanning 688 tasks files for work items...
Found 106610 work items
goroutine 1 [running]:
runtime/debug.Stack(0x0, 0x0, 0x0)
/usr/lib/go-1.6/src/runtime/debug/stack.go:24 +0x80
runtime/debug.PrintStack()
/usr/lib/go-1.6/src/runtime/debug/stack.go:16 +0x18
ciapp.RunApp.func1(0xc820a83da0)
/home/vmbuilder/qt-ci/src/ciapp/ciapp.go:58 +0x122
panic(0xf205e0, 0xc82000e0c0)
/usr/lib/go-1.6/src/runtime/panic.go:443 +0x4e9
main.(*collectorSpace).readAllTasks(0xc820a83788, 0xc825b74ac0, 0x3, 0x4, 0x0, 0x0)
/home/vmbuilder/qt-ci/src/coin/gc.go:419 +0x211
main.markRunningIntegrations(0xc820a839f8, 0xc820228180, 0x3b, 0x0, 0x0)
/home/vmbuilder/qt-ci/src/coin/gc.go:530 +0x41a
main.(*gcCommand).Run(0xc820225260, 0xc8200b6070, 0x0, 0x0, 0x0)
/home/vmbuilder/qt-ci/src/coin/gc.go:613 +0xf95
github.com/mitchellh/cli.(*CLI).Run(0xc82020b040, 0xc820224f90, 0x0, 0x0)
/home/vmbuilder/qt-ci/src/github.com/mitchellh/cli/cli.go:100 +0x40c
ciapp.CreateCLIAppWithArgs.func1(0x7fab9d389d48, 0xc82021ff80, 0x0, 0x0)
/home/vmbuilder/qt-ci/src/ciapp/command.go:47 +0x2c1
ciapp.RunApp(0xc82021ff40)
/home/vmbuilder/qt-ci/src/ciapp/ciapp.go:121 +0xba5
main.main()
/home/vmbuilder/qt-ci/src/coin/main.go:20 +0x4f
coin:2016/11/03 10:33:38 ciapp.go:62: Error: Panic: runtime error: invalid memory address or nil pointer dereference