diff --git a/application/models/Pota.php b/application/models/Pota.php
index 117a8c42..1c5c8a40 100644
--- a/application/models/Pota.php
+++ b/application/models/Pota.php
@@ -15,6 +15,8 @@ class Pota extends CI_Model {
 
 		$bandslots = $this->bands->get_worked_bands('pota');
 
+		if(!$bandslots) return null;
+
 		$this->db->where_in("station_id", $logbooks_locations_array);
 		$this->db->where_in("col_band", $bandslots);
 		$this->db->order_by("COL_POTA_REF", "ASC");
diff --git a/application/models/Sota.php b/application/models/Sota.php
index 6d47334e..46d7e5f5 100644
--- a/application/models/Sota.php
+++ b/application/models/Sota.php
@@ -15,6 +15,8 @@ class Sota extends CI_Model {
 
 		$bandslots = $this->bands->get_worked_bands('sota');
 
+		if(!$bandslots) return null;
+
 		$this->db->where_in("station_id", $logbooks_locations_array);
 		$this->db->where_in("col_band", $bandslots);
 		$this->db->order_by("COL_SOTA_REF", "ASC");
diff --git a/application/models/Wwff.php b/application/models/Wwff.php
index 93908d7e..e15584c3 100644
--- a/application/models/Wwff.php
+++ b/application/models/Wwff.php
@@ -15,6 +15,8 @@ class Wwff extends CI_Model {
 
 		$bandslots = $this->bands->get_worked_bands('wwff');
 
+		if(!$bandslots) return null;
+
 		$this->db->where_in("station_id", $logbooks_locations_array);
 		$this->db->where_in("col_band", $bandslots);
 		$this->db->order_by("COL_WWFF_REF", "ASC");