diff --git a/src/Microsoft.ML.AutoML/AutoMLExperiment/AutoMLExperiment.cs b/src/Microsoft.ML.AutoML/AutoMLExperiment/AutoMLExperiment.cs
index e2fa5b9716..90edcb8e08 100644
--- a/src/Microsoft.ML.AutoML/AutoMLExperiment/AutoMLExperiment.cs
+++ b/src/Microsoft.ML.AutoML/AutoMLExperiment/AutoMLExperiment.cs
@@ -342,7 +342,7 @@ Abandoning Trial {trialSettings.TrialId} and continue training.
             trialResultManager?.Save();
             if (_bestTrialResult == null)
             {
-                throw new TimeoutException("Training time finished without completing a trial run");
+                throw new TimeoutException("Training time finished without completing a successful trial. Either no trial completed or the metric for all completed trials are NaN or Infinity");
             }
             else
             {