diff --git a/src/caches.ts b/src/caches.ts
index 48c3938..3714735 100644
--- a/src/caches.ts
+++ b/src/caches.ts
@@ -17,7 +17,17 @@ export const cacheMiddleware = (): MiddlewareHandler => async (c, next) => {
 
   console.log('cacheUrl', cacheUrl);
 
-  const cacheKey = new Request(cacheUrl.toString(), request);
+  let cacheKey: Request;
+
+  try {
+    cacheKey = new Request(cacheUrl.toString(), request);
+  } catch(e) {
+    /* In Miniflare, you can't really create requests like this, so we ignore caching in the test environment */
+    await next();
+    return c.res.clone();
+  }
+
+  
   const cache = caches.default;
 
   switch (request.method) {
diff --git a/src/fetch.ts b/src/fetch.ts
index 760f3fb..5d719ed 100644
--- a/src/fetch.ts
+++ b/src/fetch.ts
@@ -24,7 +24,7 @@ export const twitterFetch = async (
   url: string,
   useElongator = experimentCheck(
     Experiment.ELONGATOR_BY_DEFAULT,
-    typeof c.env.TwitterProxy !== 'undefined'
+    typeof c.env?.TwitterProxy !== 'undefined'
   ),
   validateFunction: (response: unknown) => boolean,
   elongatorRequired = false
@@ -141,10 +141,10 @@ export const twitterFetch = async (
     let apiRequest;
 
     try {
-      if (useElongator && typeof c.env.TwitterProxy !== 'undefined') {
+      if (useElongator && typeof c.env?.TwitterProxy !== 'undefined') {
         console.log('Fetching using elongator');
         const performanceStart = performance.now();
-        apiRequest = await c.env.TwitterProxy.fetch(url, {
+        apiRequest = await c.env?.TwitterProxy.fetch(url, {
           method: 'GET',
           headers: headers
         });
@@ -189,7 +189,7 @@ export const twitterFetch = async (
     if (
       !wasElongatorDisabled &&
       !useElongator &&
-      typeof c.env.TwitterProxy !== 'undefined' &&
+      typeof c.env?.TwitterProxy !== 'undefined' &&
       (response as TweetResultsByRestIdResult)?.data?.tweetResult?.result?.reason ===
         'NsfwLoggedOut'
     ) {
@@ -251,7 +251,7 @@ export const fetchUser = async (
   c: Context,
   useElongator = experimentCheck(
     Experiment.ELONGATOR_PROFILE_API,
-    typeof c.env.TwitterProxy !== 'undefined'
+    typeof c.env?.TwitterProxy !== 'undefined'
   )
 ): Promise<GraphQLUserResponse> => {
   return (await twitterFetch(
diff --git a/src/helpers/translate.ts b/src/helpers/translate.ts
index fcdc22d..e1368e0 100644
--- a/src/helpers/translate.ts
+++ b/src/helpers/translate.ts
@@ -46,14 +46,14 @@ export const translateTweet = async (
   headers['x-twitter-client-language'] = language;
 
   /* As of August 2023, you can no longer fetch translations with guest token */
-  if (typeof c.env.TwitterProxy === 'undefined') {
+  if (typeof c.env?.TwitterProxy === 'undefined') {
     return null;
   }
 
   try {
     const url = `${Constants.TWITTER_ROOT}/i/api/1.1/strato/column/None/tweetId=${tweet.rest_id},destinationLanguage=None,translationSource=Some(Google),feature=None,timeout=None,onlyCached=None/translation/service/translateTweet`;
     console.log(url, headers);
-    translationApiResponse = await c.env.TwitterProxy.fetch(url, {
+    translationApiResponse = await c.env?.TwitterProxy.fetch(url, {
       method: 'GET',
       headers: headers
     });
diff --git a/src/providers/twitter/conversation.ts b/src/providers/twitter/conversation.ts
index 5ee022f..da6bf9b 100644
--- a/src/providers/twitter/conversation.ts
+++ b/src/providers/twitter/conversation.ts
@@ -8,7 +8,7 @@ import { Context } from 'hono';
 export const fetchTweetDetail = async (
   c: Context,
   status: string,
-  useElongator = typeof c.env.TwitterProxy !== 'undefined',
+  useElongator = typeof c.env?.TwitterProxy !== 'undefined',
   cursor: string | null = null
 ): Promise<TweetDetailResult> => {
   return (await twitterFetch(
@@ -93,7 +93,7 @@ export const fetchByRestId = async (
   c: Context,
   useElongator = experimentCheck(
     Experiment.ELONGATOR_BY_DEFAULT,
-    typeof c.env.TwitterProxy !== 'undefined'
+    typeof c.env?.TwitterProxy !== 'undefined'
   )
 ): Promise<TweetResultsByRestIdResult> => {
   return (await twitterFetch(
@@ -287,7 +287,7 @@ export const constructTwitterThread = async (
      Also - dirty hack. Right now, TweetDetail requests aren't working with language and I haven't figured out why.
      I'll figure out why eventually, but for now just don't use TweetDetail for this. */
   if (
-    typeof c.env.TwitterProxy !== 'undefined' &&
+    typeof c.env?.TwitterProxy !== 'undefined' &&
     !language &&
     (experimentCheck(Experiment.TWEET_DETAIL_API) || processThread)
   ) {
diff --git a/src/types/env.d.ts b/src/types/env.d.ts
index c73b538..1e4051b 100644
--- a/src/types/env.d.ts
+++ b/src/types/env.d.ts
@@ -12,9 +12,4 @@ declare const MOSAIC_DOMAIN_LIST: string;
 declare const API_HOST_LIST: string;
 
 declare const SENTRY_DSN: string;
-declare const RELEASE_NAME: string;
-
-declare const TEST: boolean | undefined;
-
-declare const TwitterProxy: Fetcher;
-declare const AnalyticsEngine: AnalyticsEngineDataset;
+declare const RELEASE_NAME: string;
\ No newline at end of file
diff --git a/src/worker.ts b/src/worker.ts
index 1523dba..f679080 100644
--- a/src/worker.ts
+++ b/src/worker.ts
@@ -52,7 +52,8 @@ if (SENTRY_DSN) {
         allowedSearchParams: /(.*)/
       },
 
-      // integrations: [new RewriteFrames({ root: '/' }) as any],
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      integrations: [new RewriteFrames({ root: '/' }) as any],
       release: RELEASE_NAME
     })
   );