diff --git a/server/controllers/api/search.ts b/server/controllers/api/search.ts
index d95e7cac9..f408e7932 100644
--- a/server/controllers/api/search.ts
+++ b/server/controllers/api/search.ts
@@ -39,8 +39,9 @@ export { searchRouter }
 
 function searchVideos (req: express.Request, res: express.Response) {
   const query: VideosSearchQuery = req.query
-  if (query.search.startsWith('http://') || query.search.startsWith('https://')) {
-    return searchVideoUrl(query.search, res)
+  const search = query.search
+  if (search && (search.startsWith('http://') || search.startsWith('https://'))) {
+    return searchVideoUrl(search, res)
   }
 
   return searchVideosDB(query, res)
diff --git a/server/initializers/constants.ts b/server/initializers/constants.ts
index cd709cd3f..46b63c5e9 100644
--- a/server/initializers/constants.ts
+++ b/server/initializers/constants.ts
@@ -112,7 +112,7 @@ const JOB_TTL: { [ id in JobType ]: number } = {
   'email': 60000 * 10 // 10 minutes
 }
 const BROADCAST_CONCURRENCY = 10 // How many requests in parallel we do in activitypub-http-broadcast job
-const CRAWL_REQUEST_CONCURRENCY = 5 // How many requests in parallel to fetch remote data (likes, shares...)
+const CRAWL_REQUEST_CONCURRENCY = 1 // How many requests in parallel to fetch remote data (likes, shares...)
 const JOB_REQUEST_TIMEOUT = 3000 // 3 seconds
 const JOB_COMPLETED_LIFETIME = 60000 * 60 * 24 * 2 // 2 days
 
diff --git a/server/lib/avatar.ts b/server/lib/avatar.ts
index 7fdef008c..5cfb81fc7 100644
--- a/server/lib/avatar.ts
+++ b/server/lib/avatar.ts
@@ -1,5 +1,4 @@
 import 'multer'
-import * as uuidv4 from 'uuid'
 import { sendUpdateActor } from './activitypub/send'
 import { AVATARS_SIZE, CONFIG, sequelizeTypescript } from '../initializers'
 import { updateActorAvatarInstance } from './activitypub'
@@ -15,7 +14,7 @@ async function updateActorAvatarFile (
   accountOrChannel: AccountModel | VideoChannelModel
 ) {
   const extension = extname(avatarPhysicalFile.filename)
-  const avatarName = uuidv4() + extension
+  const avatarName = actor.uuid + extension
   const destination = join(CONFIG.STORAGE.AVATARS_DIR, avatarName)
   await processImage(avatarPhysicalFile, destination, AVATARS_SIZE)
 
diff --git a/server/tests/api/check-params/video-imports.ts b/server/tests/api/check-params/video-imports.ts
index 5975985a1..44645b0e2 100644
--- a/server/tests/api/check-params/video-imports.ts
+++ b/server/tests/api/check-params/video-imports.ts
@@ -28,7 +28,6 @@ describe('Test video imports API validator', function () {
   let userAccessToken = ''
   let accountName: string
   let channelId: number
-  let channelUUID: string
 
   // ---------------------------------------------------------------
 
@@ -49,7 +48,6 @@ describe('Test video imports API validator', function () {
     {
       const res = await getMyUserInformation(server.url, server.accessToken)
       channelId = res.body.videoChannels[ 0 ].id
-      channelUUID = res.body.videoChannels[ 0 ].uuid
       accountName = res.body.account.name + '@' + res.body.account.host
     }
   })
diff --git a/server/tests/api/users/users-multiple-servers.ts b/server/tests/api/users/users-multiple-servers.ts
index 575e04546..b67072851 100644
--- a/server/tests/api/users/users-multiple-servers.ts
+++ b/server/tests/api/users/users-multiple-servers.ts
@@ -27,6 +27,7 @@ describe('Test users with multiple servers', function () {
   let servers: ServerInfo[] = []
   let user: User
   let userAccountName: string
+  let userAccountUUID: string
   let userVideoChannelUUID: string
   let userId: number
   let videoUUID: string
@@ -62,7 +63,9 @@ describe('Test users with multiple servers', function () {
 
     {
       const res = await getMyUserInformation(servers[0].url, userAccessToken)
-      userAccountName = res.body.account.name + '@' + res.body.account.host
+      const account: Account = res.body.account
+      userAccountName = account.name + '@' + account.host
+      userAccountUUID = account.uuid
     }
 
     {
@@ -196,7 +199,7 @@ describe('Test users with multiple servers', function () {
 
   it('Should not have actor files', async () => {
     for (const server of servers) {
-      await checkActorFilesWereRemoved(userAccountName, server.serverNumber)
+      await checkActorFilesWereRemoved(userAccountUUID, server.serverNumber)
       await checkActorFilesWereRemoved(userVideoChannelUUID, server.serverNumber)
     }
   })
diff --git a/server/tests/api/videos/video-nsfw.ts b/server/tests/api/videos/video-nsfw.ts
index 370e69d2a..891148b07 100644
--- a/server/tests/api/videos/video-nsfw.ts
+++ b/server/tests/api/videos/video-nsfw.ts
@@ -34,7 +34,7 @@ describe('Test video NSFW policy', function () {
     return getMyUserInformation(server.url, server.accessToken)
       .then(res => {
         const user: User = res.body
-        const videoChannelUUID = user.videoChannels[0].uuid
+        const videoChannelName = user.videoChannels[0].name
         const accountName = user.account.name + '@' + user.account.host
 
         if (token) {
@@ -42,7 +42,7 @@ describe('Test video NSFW policy', function () {
             getVideosListWithToken(server.url, token, query),
             searchVideoWithToken(server.url, 'n', token, query),
             getAccountVideos(server.url, token, accountName, 0, 5, undefined, query),
-            getVideoChannelVideos(server.url, token, videoChannelUUID, 0, 5, undefined, query)
+            getVideoChannelVideos(server.url, token, videoChannelName, 0, 5, undefined, query)
           ])
         }
 
@@ -50,7 +50,7 @@ describe('Test video NSFW policy', function () {
           getVideosList(server.url),
           searchVideo(server.url, 'n'),
           getAccountVideos(server.url, undefined, accountName, 0, 5),
-          getVideoChannelVideos(server.url, undefined, videoChannelUUID, 0, 5)
+          getVideoChannelVideos(server.url, undefined, videoChannelName, 0, 5)
         ])
       })
   }
diff --git a/server/tests/cli/update-host.ts b/server/tests/cli/update-host.ts
index 7f54c0e70..b89e72ab7 100644
--- a/server/tests/cli/update-host.ts
+++ b/server/tests/cli/update-host.ts
@@ -94,9 +94,9 @@ describe('Test update host scripts', function () {
     expect(res.body.total).to.equal(3)
 
     for (const channel of res.body.data) {
-      const { body } = await makeActivityPubGetRequest(server.url, '/video-channels/' + channel.uuid)
+      const { body } = await makeActivityPubGetRequest(server.url, '/video-channels/' + channel.name)
 
-      expect(body.id).to.equal('http://localhost:9002/video-channels/' + channel.uuid)
+      expect(body.id).to.equal('http://localhost:9002/video-channels/' + channel.name)
     }
   })