diff --git a/core/state-manager.js b/core/state-manager.js
index be6dd6c2..91c9a2ec 100644
--- a/core/state-manager.js
+++ b/core/state-manager.js
@@ -33,9 +33,11 @@ var stateManager = {};
 stateManager.registerInjection = function (tabIdentifier, injection, url) {
     let injectionIdentifier, registeredTab, injectionCount, missingCount, initiatorDomain, listedToManipulateDOM;
 
-    injectionIdentifier = injection.source + injection.path;
-    registeredTab = stateManager.tabs[tabIdentifier];
-    registeredTab.injections[injectionIdentifier] = injection;
+    if (injection['result'] !== false) {
+        injectionIdentifier = injection.source + injection.path;
+        registeredTab = stateManager.tabs[tabIdentifier];
+        registeredTab.injections[injectionIdentifier] = injection;
+    }
 
     initiatorDomain = helpers.extractDomainFromUrl(url, true) || Address.EXAMPLE;
     listedToManipulateDOM = stateManager._domainIsListed(initiatorDomain, 'manipulate-dom');
@@ -357,7 +359,7 @@ chrome.webRequest.onErrorOccurred.addListener(function (requestDetails) {
 
 chrome.webRequest.onBeforeRedirect.addListener(function (requestDetails) {
     let knownRequest = stateManager.requests[requestDetails.requestId];
-    if (knownRequest['targetDetails']['result'] !== false) {
+    if (knownRequest) {
         stateManager.registerInjection(
             knownRequest.tabIdentifier,
             knownRequest.targetDetails,