diff --git a/lib/NetworkManager.js b/lib/NetworkManager.js
index 8f17dfb5c62..64e3b129e28 100644
--- a/lib/NetworkManager.js
+++ b/lib/NetworkManager.js
@@ -151,9 +151,10 @@ class NetworkManager extends EventEmitter {
 
     if (event.redirectUrl) {
       const request = this._interceptionIdToRequest.get(event.interceptionId);
-      console.assert(request, 'INTERNAL ERROR: failed to find request for interception redirect.');
-      this._handleRequestRedirect(request, event.responseStatusCode, event.responseHeaders);
-      this._handleRequestStart(request._requestId, event.interceptionId, event.redirectUrl, event.resourceType, event.request, event.frameId);
+      if (request) {
+        this._handleRequestRedirect(request, event.responseStatusCode, event.responseHeaders);
+        this._handleRequestStart(request._requestId, event.interceptionId, event.redirectUrl, event.resourceType, event.request, event.frameId);
+      }
       return;
     }
     const requestHash = generateRequestHash(event.request);