IPB4: Correctly handle not reading any threads in an iteration

diff --git a/files/lib/system/exporter/IPB4xExporter.class.php b/files/lib/system/exporter/IPB4xExporter.class.php
index 0ad5a89e2c6579bd521a213a1b48260d6b3f7bad..1485697f8bbcfe7973392035df3436459dfc1a02 100644 (file)
--- a/files/lib/system/exporter/IPB4xExporter.class.php
+++ b/files/lib/system/exporter/IPB4xExporter.class.php
@@ -868,6 +868,10 @@ class IPB4xExporter extends AbstractExporter
             $threadIDs[] = $row['tid'];
         }
 
+        if (empty($threadIDs)) {
+            return;
+        }
+
         // get tags
         $tags = $this->getTags('forums', 'forums', $threadIDs);