{"record":{"id":"26876d40a896efee","repo":"kubernetes/kops","slug":"asstring-called-on-nil-certificate","errorCode":null,"errorMessage":"AsString called on nil Certificate","messagePattern":"AsString called on nil Certificate","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/pki/certificate.go","lineNumber":116,"sourceCode":"\t\tblock, rest := pem.Decode(pemData)\n\t\tif block == nil {\n\t\t\treturn nil, fmt.Errorf(\"could not parse certificate\")\n\t\t}\n\n\t\tif block.Type == \"CERTIFICATE\" {\n\t\t\tklog.V(10).Infof(\"Parsing pem block: %q\", block.Type)\n\t\t\treturn x509.ParseCertificate(block.Bytes)\n\t\t}\n\t\tklog.Infof(\"Ignoring unexpected PEM block: %q\", block.Type)\n\n\t\tpemData = rest\n\t}\n}\n\nfunc (c *Certificate) AsString() (string, error) {\n\t// Nicer behaviour because this is called from templates\n\tif c == nil {\n\t\treturn \"\", fmt.Errorf(\"AsString called on nil Certificate\")\n\t}\n\n\tvar data bytes.Buffer\n\t_, err := c.WriteTo(&data)\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"error writing SSL certificate: %v\", err)\n\t}\n\treturn data.String(), nil\n}\n\nfunc (c *Certificate) AsBytes() ([]byte, error) {\n\t// Nicer behaviour because this is called from templates\n\tif c == nil {\n\t\treturn nil, fmt.Errorf(\"AsBytes called on nil Certificate\")\n\t}\n\n\tvar data bytes.Buffer\n\t_, err := c.WriteTo(&data)","sourceCodeStart":98,"sourceCodeEnd":134,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/pkg/pki/certificate.go#L98-L134","documentation":"Certificate.AsString is called from templates and cannot return a helpful error via a nil pointer, so it explicitly guards c == nil and returns this sentinel. It fires when a template or task references a certificate variable that was never provisioned — the real problem is the missing/failed certificate earlier in the dependency chain.","triggerScenarios":"Thrown at pkg/pki/certificate.go:116 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Ensure the certificate was loaded/issued before rendering templates that call AsString","Check why the Certificate reference is nil (failed parse, missing keychain entry)","Guard template logic against missing certificates"],"exampleFix":null,"handlingStrategy":"type-guard","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T07:17:12.445Z"}