diff --git a/parser/src/main/java/com/microsoft/gctoolkit/parser/jvm/PreUnifiedDiarizer.java b/parser/src/main/java/com/microsoft/gctoolkit/parser/jvm/PreUnifiedDiarizer.java
index 1bf6beb6a..aa46b134e 100644
--- a/parser/src/main/java/com/microsoft/gctoolkit/parser/jvm/PreUnifiedDiarizer.java
+++ b/parser/src/main/java/com/microsoft/gctoolkit/parser/jvm/PreUnifiedDiarizer.java
@@ -228,9 +228,8 @@ public boolean diarize(String line) {
 
     @Override
     public DateTimeStamp getTimeOfFirstEvent() {
-        if (timeOfFirstEvent == null)
-            timeOfFirstEvent = new DateTimeStamp(0.0d);
-        return timeOfFirstEvent;
+        // Keep the fallback transient so a timestamp found on a later line can still be recorded.
+        return timeOfFirstEvent == null ? new DateTimeStamp(0.0d) : timeOfFirstEvent;
     }
 
     private void timeOfFirstEvent(String line) {
@@ -1047,4 +1046,5 @@ private void setGCCause(String gcCause) {
             }
         }
     }
-}
\ No newline at end of file
+}
+