How do you make a decision on a test if there are no guilty parties?

If no statistically significant differences are found in an A/B test ("no fault"), the decision depends on the context and goals:

• Keep the current version: if the new version does not show improvements, you can keep the old one to avoid risking deterioration.
• Conduct additional analysis: it may be worth checking user segments, metrics, or test duration — the effect might be hidden.
• Reconsider hypotheses and metrics: perhaps the chosen metrics do not reflect real value, or the hypothesis is incorrect.
• Run the test again or with modifications: increase the sample size, change parameters to obtain more accurate data.

It is important not to make hasty decisions but to use the test results as part of the overall process of product improvement.