{"record":{"id":"10c04eff32f1749e","repo":"Humanizr/Humanizer","slug":"input-words-cannot-be-empty-10c04e","errorCode":null,"errorMessage":"Input words cannot be empty.","messagePattern":"Input words cannot be empty\\.","errorType":"exception","errorClass":"ArgumentException","httpStatus":null,"severity":"error","filePath":"src/Humanizer/Localisation/WordsToNumber/PrefixedTensScaleWordsToNumberConverter.cs","lineNumber":32,"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 = Normalize(words);\n        var negative = false;\n\n        foreach (var prefix in profile.NegativePrefixes)\n        {\n            if (!normalized.StartsWith(prefix, StringComparison.Ordinal))\n            {\n                continue;\n            }\n\n            negative = true;\n            normalized = normalized[prefix.Length..];\n            break;\n        }\n\n        normalized = CollapseCompoundSeparators(normalized);","sourceCodeStart":14,"sourceCodeEnd":50,"githubUrl":"https://github.com/Humanizr/Humanizer/blob/ffc2b77c0f30d2fb176875841424379319d0ae9b/src/Humanizer/Localisation/WordsToNumber/PrefixedTensScaleWordsToNumberConverter.cs#L14-L50","documentation":"PrefixedTensScaleWordsToNumberConverter.TryConvert throws this ArgumentException at line 32 for null, empty, or whitespace input. Because it lives in the Try overload, both ToNumber and TryToNumber throw on empty input; the parser cannot tokenize an empty phrase.","triggerScenarios":"Passing null, string.Empty, or whitespace-only strings to ToNumber or TryToNumber on a locale using the prefixed-tens-scale converter. The IsNullOrWhiteSpace check at line 31 fires before normalization.","commonSituations":"Blank form fields, trimmed-to-empty values, missing data substituted with empty, unvalidated external input.","solutions":["Pre-check !string.IsNullOrWhiteSpace(words) before calling any number method.","Handle blank as a caller-side condition (skip, reprompt) rather than letting the parser reject it.","Normalize upstream so empty never reaches the converter."],"exampleFix":"// before\nvar ok = \"\".TryToNumber(out var n, culture);\n// after\nvar ok = !string.IsNullOrWhiteSpace(input) && input.TryToNumber(out var n, culture);","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":["Always guard IsNullOrWhiteSpace before number-word calls.","Treat blank input as a caller condition.","Centralize empty-input handling."],"tags":["words-to-number","prefixed-tens-scale","input-validation","argumentexception","parsing"],"backgroundTag":null,"analyzedSha":"ffc2b77c0f30d2fb176875841424379319d0ae9b","analyzedAt":"2026-08-13T21:42:34.584Z","schemaVersion":2},"datasetVersion":"2026-08-14T05:17:29.042Z"}