diff --git a/kfet/templates/kfet/kpsul.html b/kfet/templates/kfet/kpsul.html
index ff64e960..bcd260f5 100644
--- a/kfet/templates/kfet/kpsul.html
+++ b/kfet/templates/kfet/kpsul.html
@@ -116,6 +116,9 @@ $(document).ready(function() {
     // General
     // -----
 
+    // Lock to avoid multiple requests
+    lock = 0;
+
     // Retrieve settings
 
     settings = {}
@@ -369,6 +372,9 @@ $(document).ready(function() {
     var operations     = $('#operation_formset');
 
     function performOperations(password = '') {
+        if (lock == 1)
+            return false;
+        lock = 1;
         var data = operationGroup.serialize() + '&' + operations.serialize();
         $.ajax({
             dataType: "json",
@@ -383,6 +389,7 @@ $(document).ready(function() {
         })
         .done(function(data) {
             coolReset();
+            lock = 0;
         })
         .fail(function($xhr) {
             var data = $xhr.responseJSON;
@@ -398,6 +405,7 @@ $(document).ready(function() {
                     }
                     break;
             }
+            lock = 0;
         });
     }
 
@@ -414,6 +422,9 @@ $(document).ready(function() {
     var cancelForm   = $('#cancel_form');
 
     function cancelOperations(opes_array, password = '') {
+        if (lock == 1)
+            return false
+        lock = 1;
         var data = { 'operations' : opes_array }
         $.ajax({
             dataType: "json",
@@ -429,6 +440,7 @@ $(document).ready(function() {
         })
         .done(function(data) {
             coolReset();
+            lock = 0;
         })
         .fail(function($xhr) {
             var data = $xhr.responseJSON;
@@ -442,7 +454,7 @@ $(document).ready(function() {
                     displayErrors(getErrorsHtml(data));
                     break;
             }
-
+            lock = 0;
         });
     }