phacility/phabricator · error · Exception

Unable to decode base64 data!

Error message

Unable to decode base64 data!

What it means

Error "Unable to decode base64 data!" thrown in phacility/phabricator.

Source

Thrown at src/applications/files/conduit/FileConduitAPIMethod.php:86

      throw new Exception(
        pht(
          'Chunk end byte is %d, not %d.',
          $chunk->getByteEnd(),
          $end));
    }

    if ($chunk->getDataFilePHID()) {
      throw new Exception(
        pht('Chunk has already been uploaded.'));
    }

    return $chunk;
  }

  protected function decodeBase64($data) {
    $data = base64_decode($data, $strict = true);
    if ($data === false) {
      throw new Exception(pht('Unable to decode base64 data!'));
    }
    return $data;
  }

  protected function loadAnyMissingChunk(
    PhabricatorUser $viewer,
    PhabricatorFile $file) {

    return $this->newChunkQuery($viewer, $file)
      ->withIsComplete(false)
      ->setLimit(1)
      ->execute();
  }

  private function newChunkQuery(
    PhabricatorUser $viewer,
    PhabricatorFile $file) {

View on GitHub (pinned to 5720a38cfe)

When it happens

Trigger: Thrown at src/applications/files/conduit/FileConduitAPIMethod.php:86 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

AI-assisted analysis of phacility/phabricator@5720a38cfe (2026-08-21). Data as JSON: /api/errors/1640bf21dc5f51b4. Report an issue: GitHub.