diff --git a/core/trino-main/src/main/java/io/trino/operator/TaskContext.java b/core/trino-main/src/main/java/io/trino/operator/TaskContext.java
index 0cffc6deccfc..b5651244e26b 100644
--- a/core/trino-main/src/main/java/io/trino/operator/TaskContext.java
+++ b/core/trino-main/src/main/java/io/trino/operator/TaskContext.java
@@ -559,9 +559,12 @@ public TaskStats getTaskStats()
 
         synchronized (cumulativeMemoryLock) {
             long currentTimeNanos = System.nanoTime();
-            double sinceLastPeriodMillis = (currentTimeNanos - lastTaskStatCallNanos) / 1_000_000.0;
-            long averageUserMemoryForLastPeriod = (userMemory + lastUserMemoryReservation) / 2;
-            cumulativeUserMemory.addAndGet(averageUserMemoryForLastPeriod * sinceLastPeriodMillis);
+
+            if (lastTaskStatCallNanos != 0) {
+                double sinceLastPeriodMillis = (currentTimeNanos - lastTaskStatCallNanos) / 1_000_000.0;
+                long averageUserMemoryForLastPeriod = (userMemory + lastUserMemoryReservation) / 2;
+                cumulativeUserMemory.addAndGet(averageUserMemoryForLastPeriod * sinceLastPeriodMillis);
+            }
 
             lastTaskStatCallNanos = currentTimeNanos;
             lastUserMemoryReservation = userMemory;