diff --git a/collectors/db_queries.php b/collectors/db_queries.php
index 25100129..5053db70 100644
--- a/collectors/db_queries.php
+++ b/collectors/db_queries.php
@@ -236,7 +236,7 @@ public function process_db_object() {
 			'is_main_query' => true,
 		) );
 
-		$this->data->total_qs = count( $this->data->rows );
+		$this->data->total_qs = count( $this->data->rows ?? [] );
 		$this->data->total_time = $total_time;
 		$this->data->has_result = $has_result;
 		$this->data->has_trace = $has_trace;