ECR: "Error decompression data 'gzip'" error — what it means and what to do

When the gzip decompression error appears

• During receipt fiscalization.

• When opening or closing a shift.

• When generating a Z-report.

• Most often — during periods of overload of the State Tax Service servers or unstable connection.

How to understand that the failure occurred on the side of the State Tax Service

• Message: Error decompression data 'gzip'.

• Ukrainian version: data decompression error 'gzip'.

• The receipt does not receive a fiscal number.

• The operation status remains non-fiscalized.

Why the pECR returns a gzip error

1. Failure in the response from the State Tax Service server — the server returned a corrupted gzip packet.

2. Temporary overload of the State Tax Service gateway — the request was accepted, but the response was generated incorrectly.

What to do in case of a gzip error

Step 1. Repeat the operation (main solution)

In most cases, the failure is short-term.

1. Wait 1–2 minutes.

2. Press Payment / Fiscalization again.

Expected result: the receipt is processed successfully without additional actions.

Step 2. Check the receipt status (if necessary)

If the error repeats:

1. Log in to the Taxpayer’s Electronic Cabinet.

2. Check whether the receipt appears among the registered ones.

• If the receipt is there — do not process it again in Torgsoft (to avoid duplication).

• If the receipt is not there (a typical situation for a gzip error) — proceed to Step 3.

Step 3. Work in offline mode (if the State Tax Service is unavailable for a long time)

1. Switch the pECR to offline mode (if there is a time limit and reserved fiscal numbers are available).

2. Continue working — the receipts will be sent automatically after the connection is restored.

How to check that the issue has been resolved

• The receipt has received a fiscal number.

• The error message no longer appears.

• The operation is displayed in the pECR history.

How to reduce the risk of the error recurring

• Update Torgsoft to the latest version. The new versions implement improved processing of responses from the State Tax Service so that such failures do not appear as a critical error.

• During mass failures, check announcements from the State Tax Service about technical maintenance.

Програма обліку товару для інтернет-магазинів, крамниць, торгових точок, складів та виробництва