diff --git a/src/js/tab.js b/src/js/tab.js
index 50504f47a..cb0f6febd 100644
--- a/src/js/tab.js
+++ b/src/js/tab.js
@@ -912,7 +912,7 @@ vAPI.tabs.registerListeners();
 {
     const NoPageStore = class extends µBlock.PageStore {
         getNetFilteringSwitch(fctxt) {
-            if ( fctxt.docId === 0 ) {
+            if ( fctxt && fctxt.docId === 0 ) {
                 const docOrigin = fctxt.getDocOrigin();
                 if ( docOrigin ) {
                     return µBlock.getNetFilteringSwitch(docOrigin);
diff --git a/src/js/traffic.js b/src/js/traffic.js
index 96b5ad6f4..9b587e3ca 100644
--- a/src/js/traffic.js
+++ b/src/js/traffic.js
@@ -440,7 +440,7 @@ const onHeadersReceived = function(details) {
         if ( isRootDoc === false ) { return; }
         pageStore = µb.bindTabToPageStats(fctxt.tabId, 'beforeRequest');
     }
-    if ( pageStore.getNetFilteringSwitch() === false ) { return; }
+    if ( pageStore.getNetFilteringSwitch(fctxt) === false ) { return; }
 
     // Keep in mind response headers will be modified in-place if needed, so
     // `details.responseHeaders` will always point to the modified response