{"record":{"id":"3c2f4352256d45d0","repo":"Humanizr/Humanizer","slug":"input-words-cannot-be-empty-3c2f43","errorCode":null,"errorMessage":"Input words cannot be empty.","messagePattern":"Input words cannot be empty\\.","errorType":"validation","errorClass":"ArgumentException","httpStatus":null,"severity":"error","filePath":"src/Humanizer/Localisation/WordsToNumber/VigesimalCompoundWordsToNumberConverter.cs","lineNumber":30,"sourceCode":"    {\n        if (!TryConvert(words, out var parsedValue, out var unrecognizedWord))\n        {\n            throw new ArgumentException($\"Unrecognized number word: {unrecognizedWord}\");\n        }\n\n        return parsedValue;\n    }\n\n    /// <inheritdoc />\n    public override bool TryConvert(string words, out long parsedValue) =>\n        TryConvert(words, out parsedValue, out _);\n\n    /// <inheritdoc />\n    public override bool TryConvert(string words, out long parsedValue, out string? unrecognizedWord)\n    {\n        if (string.IsNullOrWhiteSpace(words))\n        {\n            throw new ArgumentException(\"Input words cannot be empty.\");\n        }\n\n        var normalized = TokenMapWordsToNumberNormalizer.Normalize(words, TokenMapNormalizationProfile.LowercaseReplacePeriodsWithSpaces);\n        var negative = false;\n\n        foreach (var negativePrefix in profile.NegativePrefixes)\n        {\n            if (!normalized.StartsWith(negativePrefix, StringComparison.Ordinal))\n            {\n                continue;\n            }\n\n            negative = true;\n            normalized = normalized[negativePrefix.Length..].Trim();\n            break;\n        }\n\n        if (profile.OrdinalMap.TryGetValue(normalized, out var value) ||","sourceCodeStart":12,"sourceCodeEnd":48,"githubUrl":"https://github.com/Humanizr/Humanizer/blob/ffc2b77c0f30d2fb176875841424379319d0ae9b/src/Humanizer/Localisation/WordsToNumber/VigesimalCompoundWordsToNumberConverter.cs#L12-L48","documentation":"VigesimalCompoundWordsToNumberConverter.TryConvert throws this ArgumentException at line 30 for null, empty, or whitespace input. It sits in the Try overload, so both ToNumber and TryToNumber throw on empty phrases; the converter needs at least one token to apply the base-20 grammar.","triggerScenarios":"Passing null, string.Empty, or whitespace to any number method on a vigesimal-compound locale. The IsNullOrWhiteSpace check at line 29 fires before normalization.","commonSituations":"Blank fields, trimmed-to-empty values, unvalidated external input, empty substitution for missing data.","solutions":["Pre-check !string.IsNullOrWhiteSpace(words) before calling any number method.","Handle blank as a caller-side condition (skip or reprompt).","Normalize upstream so empty never reaches the converter."],"exampleFix":"// before\ninput.TryToNumber(out var n, culture);  // throws if input is null/whitespace\n// after\nif (!string.IsNullOrWhiteSpace(input) && input.TryToNumber(out var n, culture))\n    Use(n);","handlingStrategy":"validation","validationCode":"if (string.IsNullOrWhiteSpace(words))\n    return Result.Skip();\nvar ok = words.TryToNumber(out var n, culture);","typeGuard":null,"tryCatchPattern":"try { var n = words.ToNumber(culture); }\ncatch (ArgumentException ex) when (ex.Message == \"Input words cannot be empty.\")\n    { /* blank input */ }","preventionTips":["Guard IsNullOrWhiteSpace before number-word calls.","Treat blank input as a caller condition.","Normalize upstream so empty never reaches the converter."],"tags":["words-to-number","vigesimal-compound","input-validation","argumentexception","parsing"],"backgroundTag":null,"analyzedSha":"ffc2b77c0f30d2fb176875841424379319d0ae9b","analyzedAt":"2026-08-13T21:42:34.584Z","schemaVersion":2},"datasetVersion":"2026-08-14T00:17:13.853Z"}