panic: DMapPipeline.execOnPartition

[derekperkins]

We've seen this panic about 250 times in the last 30 days.

https://github.com/buraksezer/olric/blob/v0.5.5/pipeline.go#L476-L484

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x1413562]

goroutine 9439775 [running]:
github.com/buraksezer/olric.(*DMapPipeline).execOnPartition(0xc005f04660, {0x30caa48, 0xc0074ba060}, 0x8a)
	/Users/derek/go/pkg/mod/github.com/buraksezer/olric@v0.5.5/pipeline.go:483 +0x222
github.com/buraksezer/olric.(*DMapPipeline).Exec.func1()
	/Users/derek/go/pkg/mod/github.com/buraksezer/olric@v0.5.5/pipeline.go:532 +0x65
golang.org/x/sync/errgroup.(*Group).Go.func1()
	/Users/derek/go/pkg/mod/golang.org/x/sync@v0.6.0/errgroup/errgroup.go:78 +0x56
created by golang.org/x/sync/errgroup.(*Group).Go in goroutine 9439533
	/Users/derek/go/pkg/mod/golang.org/x/sync@v0.6.0/errgroup/errgroup.go:75 +0x96