diff --git a/application/controllers/Gridsquares.php b/application/controllers/Gridsquares.php
index bdd702d6..1e0d2755 100644
--- a/application/controllers/Gridsquares.php
+++ b/application/controllers/Gridsquares.php
@@ -53,7 +53,7 @@ class Gridsquares extends CI_Controller {
 		$query = $this->gridsquares_model->get_confirmed_sat_squares();
 
 
-		if ($query->num_rows() > 0)
+		if ($query && $query->num_rows() > 0)
 		{
 			foreach ($query->result() as $row)
 			{
@@ -88,7 +88,7 @@ class Gridsquares extends CI_Controller {
 		// Get worked squares
 		$query = $this->gridsquares_model->get_worked_sat_squares();
 
-		if ($query->num_rows() > 0)
+		if ($query && $query->num_rows() > 0)
 		{
 			foreach ($query->result() as $row)
 			{
@@ -122,7 +122,7 @@ class Gridsquares extends CI_Controller {
 
 		$query_vucc = $this->gridsquares_model->get_worked_sat_vucc_squares();
 
-		if ($query_vucc->num_rows() > 0)
+		if ($query && $query_vucc->num_rows() > 0)
 		{
 			foreach ($query_vucc->result() as $row)
 			{
@@ -149,7 +149,7 @@ class Gridsquares extends CI_Controller {
 		// Confirmed Squares
 		$query_vucc = $this->gridsquares_model->get_confirmed_sat_vucc_squares();
 
-		if ($query_vucc->num_rows() > 0)
+		if ($query && $query_vucc->num_rows() > 0)
 		{
 			foreach ($query_vucc->result() as $row)
 			{
@@ -225,7 +225,7 @@ class Gridsquares extends CI_Controller {
 
 		$query = $this->gridsquares_model->get_band_confirmed($band);
 
-		if ($query->num_rows() > 0)
+		if ($query && $query->num_rows() > 0)
 		{
 			foreach ($query->result() as $row)
 			{
@@ -254,7 +254,7 @@ class Gridsquares extends CI_Controller {
 
 		$query = $this->gridsquares_model->get_band($band);
 
-		if ($query->num_rows() > 0)
+		if ($query && $query->num_rows() > 0)
 		{
 			foreach ($query->result() as $row)
 			{
diff --git a/application/models/Gridsquares_model.php b/application/models/Gridsquares_model.php
index 42914aad..537df547 100644
--- a/application/models/Gridsquares_model.php
+++ b/application/models/Gridsquares_model.php
@@ -7,6 +7,10 @@ class Gridsquares_model extends CI_Model {
         $CI->load->model('logbooks_model');
         $logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
+        if (!$logbooks_locations_array) {
+            return null;
+        }
+
         $this->db->select('distinct substring(COL_GRIDSQUARE,1,6) as SAT_SQUARE, COL_SAT_NAME', FALSE);
         $this->db->where_in('station_id', $logbooks_locations_array);
         $this->db->where('COL_GRIDSQUARE !=', '');
@@ -20,6 +24,10 @@ class Gridsquares_model extends CI_Model {
 		$CI->load->model('logbooks_model');
 		$logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
+        if (!$logbooks_locations_array) {
+            return null;
+        }
+
 		$location_list = "'".implode("','",$logbooks_locations_array)."'";
 
 		$sql = 'SELECT distinct substring(COL_GRIDSQUARE,1,6) as SAT_SQUARE, COL_SAT_NAME FROM '
@@ -35,6 +43,10 @@ class Gridsquares_model extends CI_Model {
 		$CI->load->model('logbooks_model');
 		$logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
+        if (!$logbooks_locations_array) {
+            return null;
+        }
+
 		$location_list = "'".implode("','",$logbooks_locations_array)."'";
 
 		$sql = 'SELECT COL_VUCC_GRIDS, COL_SAT_NAME FROM '
@@ -49,6 +61,10 @@ class Gridsquares_model extends CI_Model {
         $CI->load->model('logbooks_model');
         $logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
+        if (!$logbooks_locations_array) {
+            return null;
+        }
+
 	    $this->db->select('COL_PRIMARY_KEY, COL_VUCC_GRIDS, COL_SAT_NAME', FALSE);
         $this->db->where_in('station_id', $logbooks_locations_array);
     	$this->db->where('COL_VUCC_GRIDS !=', "");
@@ -61,6 +77,9 @@ class Gridsquares_model extends CI_Model {
         $CI->load->model('logbooks_model');
         $logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
+        if (!$logbooks_locations_array) {
+            return null;
+        }
 
         $this->db->select('distinct substring(COL_GRIDSQUARE,1,6) as GRID_SQUARES, COL_BAND', FALSE);
         $this->db->where_in('station_id', $logbooks_locations_array);
@@ -83,6 +102,10 @@ class Gridsquares_model extends CI_Model {
 		$CI->load->model('logbooks_model');
 		$logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
+        if (!$logbooks_locations_array) {
+            return null;
+        }
+
 		$location_list = "'".implode("','",$logbooks_locations_array)."'";
 
 		$sql = 'SELECT distinct substring(COL_GRIDSQUARE,1,6) as GRID_SQUARES, COL_BAND FROM '