diff --git a/ajax/ajax_asset_copy.php b/ajax/ajax_asset_copy.php
index 2b795a8c..dd648ce8 100644
--- a/ajax/ajax_asset_copy.php
+++ b/ajax/ajax_asset_copy.php
@@ -6,7 +6,7 @@ $asset_id = intval($_GET['id']);
 
 $sql = mysqli_query($mysqli, "SELECT * FROM assets 
     LEFT JOIN asset_interfaces ON interface_asset_id = asset_id AND interface_primary = 1
-    WHERE asset_id = $asset_id"
+    WHERE asset_id = $asset_id LIMIT 1"
 );
                      
 $row = mysqli_fetch_array($sql);
diff --git a/ajax/ajax_asset_edit.php b/ajax/ajax_asset_edit.php
index 2942c459..1b9d4e4e 100644
--- a/ajax/ajax_asset_edit.php
+++ b/ajax/ajax_asset_edit.php
@@ -6,7 +6,7 @@ $asset_id = intval($_GET['id']);
 
 $sql = mysqli_query($mysqli, "SELECT * FROM assets 
     LEFT JOIN asset_interfaces ON interface_asset_id = asset_id AND interface_primary = 1
-    WHERE asset_id = $asset_id"
+    WHERE asset_id = $asset_id LIMIT 1"
 );
                      
 $row = mysqli_fetch_array($sql);
diff --git a/ajax/ajax_custom_link_edit.php b/ajax/ajax_custom_link_edit.php
index 6e43bb13..872d0b6b 100644
--- a/ajax/ajax_custom_link_edit.php
+++ b/ajax/ajax_custom_link_edit.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $custom_link_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM custom_links WHERE custom_link_id = $custom_link_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM custom_links WHERE custom_link_id = $custom_link_id LIMIT 1");
 $row = mysqli_fetch_array($sql);
 $custom_link_name = nullable_htmlentities($row['custom_link_name']);
 $custom_link_uri = nullable_htmlentities($row['custom_link_uri']);
diff --git a/ajax/ajax_custom_ticket_status_edit.php b/ajax/ajax_custom_ticket_status_edit.php
index 4b0d69ce..121b115a 100644
--- a/ajax/ajax_custom_ticket_status_edit.php
+++ b/ajax/ajax_custom_ticket_status_edit.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $ticket_status_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM ticket_statuses WHERE ticket_status_id = $ticket_status_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM ticket_statuses WHERE ticket_status_id = $ticket_status_id LIMIT 1");
 $row = mysqli_fetch_array($sql);
 $ticket_status_name = nullable_htmlentities($row['ticket_status_name']);
 $ticket_status_color = nullable_htmlentities($row['ticket_status_color']);
diff --git a/ajax/ajax_document_edit.php b/ajax/ajax_document_edit.php
index 53469776..4aed1720 100644
--- a/ajax/ajax_document_edit.php
+++ b/ajax/ajax_document_edit.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $document_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM documents WHERE document_id = $document_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM documents WHERE document_id = $document_id LIMIT 1");
                      
 $row = mysqli_fetch_array($sql);
 $document_name = nullable_htmlentities($row['document_name']);
diff --git a/ajax/ajax_document_move.php b/ajax/ajax_document_move.php
index fac45cac..2f4368c4 100644
--- a/ajax/ajax_document_move.php
+++ b/ajax/ajax_document_move.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $document_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM documents WHERE document_id = $document_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM documents WHERE document_id = $document_id LIMIT 1");
                      
 $row = mysqli_fetch_array($sql);
 $client_id = intval($row['document_client_id']);
diff --git a/ajax/ajax_document_rename.php b/ajax/ajax_document_rename.php
index 86320674..019ab486 100644
--- a/ajax/ajax_document_rename.php
+++ b/ajax/ajax_document_rename.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $document_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM documents WHERE document_id = $document_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM documents WHERE document_id = $document_id LIMIT 1");
                      
 $row = mysqli_fetch_array($sql);
 $client_id = intval($row['document_client_id']);
diff --git a/ajax/ajax_document_template_edit.php b/ajax/ajax_document_template_edit.php
index 91c623ad..2c3fe1bc 100644
--- a/ajax/ajax_document_template_edit.php
+++ b/ajax/ajax_document_template_edit.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $document_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM documents WHERE document_id = $document_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM documents WHERE document_id = $document_id LIMIT 1");
 $row = mysqli_fetch_array($sql);
 $document_name = nullable_htmlentities($row['document_name']);
 $document_description = nullable_htmlentities($row['document_description']);
diff --git a/ajax/ajax_document_view.php b/ajax/ajax_document_view.php
index 02e3f11d..0286cffd 100644
--- a/ajax/ajax_document_view.php
+++ b/ajax/ajax_document_view.php
@@ -12,7 +12,7 @@ $purifier = new HTMLPurifier($purifier_config);
 
 $document_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM documents WHERE document_id = $document_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM documents WHERE document_id = $document_id LIMIT 1");
                      
 $row = mysqli_fetch_array($sql);
 $document_name = nullable_htmlentities($row['document_name']);
diff --git a/ajax/ajax_file_move.php b/ajax/ajax_file_move.php
index 87d4e3ae..fb242065 100644
--- a/ajax/ajax_file_move.php
+++ b/ajax/ajax_file_move.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $file_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM files WHERE file_id = $file_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM files WHERE file_id = $file_id LIMIT 1");
                      
 $row = mysqli_fetch_array($sql);
 $client_id = intval($row['file_client_id']);
diff --git a/ajax/ajax_file_rename.php b/ajax/ajax_file_rename.php
index 7d3ee3cb..f49dc26c 100644
--- a/ajax/ajax_file_rename.php
+++ b/ajax/ajax_file_rename.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $file_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM files WHERE file_id = $file_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM files WHERE file_id = $file_id LIMIT 1");
                      
 $row = mysqli_fetch_array($sql);
 $client_id = intval($row['file_client_id']);
diff --git a/ajax/ajax_folder_rename.php b/ajax/ajax_folder_rename.php
index 72657ebe..40929a13 100644
--- a/ajax/ajax_folder_rename.php
+++ b/ajax/ajax_folder_rename.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $folder_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM folders WHERE folder_id = $folder_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM folders WHERE folder_id = $folder_id LIMIT 1");
                      
 $row = mysqli_fetch_array($sql);
 $folder_name = nullable_htmlentities($row['folder_name']);
diff --git a/ajax/ajax_item_edit.php b/ajax/ajax_item_edit.php
index a3c567ed..7ace177e 100644
--- a/ajax/ajax_item_edit.php
+++ b/ajax/ajax_item_edit.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $item_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM invoice_items WHERE item_id = $item_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM invoice_items WHERE item_id = $item_id LIMIT 1");
 $row = mysqli_fetch_array($sql);
 $item_name = nullable_htmlentities($row['item_name']);
 $item_description = nullable_htmlentities($row['item_description']);
diff --git a/ajax/ajax_software_template_edit.php b/ajax/ajax_software_template_edit.php
index 4031e971..ee1b5d98 100644
--- a/ajax/ajax_software_template_edit.php
+++ b/ajax/ajax_software_template_edit.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $software_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM software WHERE software_id = $software_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM software WHERE software_id = $software_id LIMIT 1");
 $row = mysqli_fetch_array($sql);
 $software_name = nullable_htmlentities($row['software_name']);
 $software_version = nullable_htmlentities($row['software_version']);
diff --git a/ajax/ajax_tax_edit.php b/ajax/ajax_tax_edit.php
index 9bc05290..a2c2c47c 100644
--- a/ajax/ajax_tax_edit.php
+++ b/ajax/ajax_tax_edit.php
@@ -4,7 +4,7 @@ require_once '../includes/ajax_header.php';
 
 $tax_id = intval($_GET['id']);
 
-$sql = mysqli_query($mysqli, "SELECT * FROM taxes WHERE tax_id = $tax_id");
+$sql = mysqli_query($mysqli, "SELECT * FROM taxes WHERE tax_id = $tax_id LIMIT 1");
 $row = mysqli_fetch_array($sql);
 $tax_name = nullable_htmlentities($row['tax_name']);
 $tax_percent = floatval($row['tax_percent']);