Tekton Chains Controller crashes with SIGSEGV

Issue

• The Tekton Chains Controller crashes with SIGSEGV repeatedly, the Pod is in CrashLoopBackOff. The log shows the following error message:

  panic: runtime error: invalid memory address or nil pointer dereference
  [signal SIGSEGV: segmentation violation code=0x1 addr=0x48 pc=0x29586ed]
  
  goroutine 156 [running]:
  github.com/tektoncd/chains/pkg/chains/formats/slsa/v1/pipelinerun.buildConfig({0x3d77928?, 0xc044e8c870?}, 0xc044d68dc0)
      /go/src/github.com/tektoncd/chains/pkg/chains/formats/slsa/v1/pipelinerun/pipelinerun.go:122 +0x5ad
  github.com/tektoncd/chains/pkg/chains/formats/slsa/v1/pipelinerun.GenerateAttestation({0x3d77928, 0xc044e8c870}, 0xc044d68dc0, 0xc044d61980)
      /go/src/github.com/tektoncd/chains/pkg/chains/formats/slsa/v1/pipelinerun/pipelinerun.go:69 +0x17a
  github.com/tektoncd/chains/pkg/chains/formats/slsa/v1.(*InTotoIte6).CreatePayload(0xc044ae72d8, {0x3d77928, 0xc044e8c870}, {0x341ab60?, 0xc044e8a0c0})
      /go/src/github.com/tektoncd/chains/pkg/chains/formats/slsa/v1/intotoite6.go:85 +0x4bb
  github.com/tektoncd/chains/pkg/chains.(*ObjectSigner).Sign(0xc000c4b040, {0x3d77928, 0xc044e8c870}, {0x3db12a0, 0xc044e8a0c0})
      /go/src/github.com/tektoncd/chains/pkg/chains/signing.go:150 +0x597
  github.com/tektoncd/chains/pkg/reconciler/pipelinerun.(*Reconciler).FinalizeKind(0xc000c4b080, {0x3d77928, 0xc044e8c870}, 0xc019421208)
      /go/src/github.com/tektoncd/chains/pkg/reconciler/pipelinerun/pipelinerun.go:109 +0x80e
  github.com/tektoncd/chains/pkg/reconciler/pipelinerun.(*Reconciler).ReconcileKind(0xc000c4b080, {0x3d77928, 0xc044e8c090}, 0xc019421208)
      /go/src/github.com/tektoncd/chains/pkg/reconciler/pipelinerun/pipelinerun.go:52 +0x175
  github.com/tektoncd/pipeline/pkg/client/injection/reconciler/pipeline/v1/pipelinerun.(*reconcilerImpl).Reconcile(0xc0004d3d60, {0x3d77928, 0xc044bf3f50}, {0xc044bf5180, 0x49})
      /go/src/github.com/tektoncd/chains/vendor/github.com/tektoncd/pipeline/pkg/client/injection/reconciler/pipeline/v1/pipelinerun/reconciler.go:236 +0x4f2
  knative.dev/pkg/controller.(*Impl).processNextWorkItem(0xc000c6c480)
      /go/src/github.com/tektoncd/chains/vendor/knative.dev/pkg/controller/controller.go:542 +0x508
  knative.dev/pkg/controller.(*Impl).RunContext.func3()
      /go/src/github.com/tektoncd/chains/vendor/knative.dev/pkg/controller/controller.go:491 +0x59
  created by knative.dev/pkg/controller.(*Impl).RunContext in goroutine 154
      /go/src/github.com/tektoncd/chains/vendor/knative.dev/pkg/controller/controller.go:489 +0x325
  

• What workarounds are available for this problem?