mozilla/pdf.js · warning · Error

Invalid nValue1 in AFSimple

Error message

Invalid nValue1 in AFSimple

What it means

Thrown by AFSimple when AFMakeNumber(nValue1) returns null, i.e. nValue1 cannot be coerced to a number. AFSimple performs arithmetic (AVG/SUM/PRD/MIN/MAX) and requires both operands to be numeric, so a non-coercible first operand is rejected. It executes within the sandboxed PDF-JS form environment.

Source

Thrown at src/scripting_api/aform.js:342

        );
      }
    } else if (bGreaterThan) {
      if (value < nGreaterThan) {
        err = this._util.printf(GlobalConstants.IDS_GREATER_THAN, nGreaterThan);
      }
    } else if (value > nLessThan) {
      err = this._util.printf(GlobalConstants.IDS_LESS_THAN, nLessThan);
    }
    if (err) {
      this._app.alert(err);
      event.rc = false;
    }
  }

  AFSimple(cFunction, nValue1, nValue2) {
    const value1 = this.AFMakeNumber(nValue1);
    if (value1 === null) {
      throw new Error("Invalid nValue1 in AFSimple");
    }

    const value2 = this.AFMakeNumber(nValue2);
    if (value2 === null) {
      throw new Error("Invalid nValue2 in AFSimple");
    }

    switch (cFunction) {
      case "AVG":
        return (value1 + value2) / 2;
      case "SUM":
        return value1 + value2;
      case "PRD":
        return value1 * value2;
      case "MIN":
        return Math.min(value1, value2);
      case "MAX":
        return Math.max(value1, value2);

View on GitHub (pinned to 5903d58d58)

Solutions

1. Repair or report the PDF form script; the error is content-driven.
2. Update PDF.js to benefit from any future coercion leniency.
3. Let the embedding app tolerate scripting failures so the rest of the form still works.
4. If authoring the PDF, pass numeric values to AFSimple.

try {
  await runFormScript(...);
} catch (e) {
  if (/Invalid nValue1 in AFSimple/.test(e.message)) { /* skip calculation */ }
}

When it happens

Trigger: A PDF form script calls AFSimple(cFunction, nValue1, nValue2) where nValue1 is a non-numeric, non-coercible value (e.g. an object or unparseable string).

Common situations: A field value is empty or a non-numeric string that AFMakeNumber cannot parse; a malformed form script passes the wrong argument type.

Related errors

• Invalid nValue2 in AFSimple
• Invalid cFunction in AFSimple
• Invalid function in AFSimple_Calculate
• Invalid nDec value in AFPercent_Format
• Invalid psf in AFSpecial_Format

AI-assisted analysis of mozilla/pdf.js@5903d58d58 (2026-08-13). Data as JSON: /api/errors/816ca1cf0ea6b738. Report an issue: GitHub.