If there are no more older entries, `"oldest":""` is returned.

AGHTechDoc.md

@@ -1302,6 +1302,8 @@ Response:
 
 The most recent entries are at the top of list.
 
+If there are no more older entries, `"oldest":""` is returned.
+
 
 ### API: Set querylog parameters
 

querylog/querylog_search.go

@@ -129,7 +129,9 @@ func (l *queryLog) searchFiles(params *searchParams) ([]*logEntry, time.Time, in
 		}
 	}
 
-	oldest = time.Unix(0, oldestNano)
+	if oldestNano != 0 {
+		oldest = time.Unix(0, oldestNano)
+	}
 	return entries, oldest, total
 }