diff --git a/server/initializers/constants.ts b/server/initializers/constants.ts
index 705d9b520..481b21bbb 100644
--- a/server/initializers/constants.ts
+++ b/server/initializers/constants.ts
@@ -226,7 +226,7 @@ const CONSTRAINTS_FIELDS = {
     COUNT: { min: 0 }
   },
   VIDEO_COMMENTS: {
-    TEXT: { min: 2, max: 3000 }, // Length
+    TEXT: { min: 1, max: 3000 }, // Length
     URL: { min: 3, max: 2000 } // Length
   },
   VIDEO_SHARE: {
diff --git a/server/tools/import-videos.ts b/server/tools/import-videos.ts
index 433cee652..baaedd329 100644
--- a/server/tools/import-videos.ts
+++ b/server/tools/import-videos.ts
@@ -53,7 +53,10 @@ async function run () {
 
   const options = [ '-j', '--flat-playlist', '--playlist-reverse' ]
   youtubeDL.getInfo(program['targetUrl'], options, processOptions, async (err, info) => {
-    if (err) throw err
+    if (err) {
+      console.log(err.message)
+      process.exit(1)
+    }
 
     let infoArray: any[]
 
@@ -157,7 +160,8 @@ async function uploadVideoOnPeerTube (videoInfo: any, videoPath: string, languag
 
       await uploadVideo(program['url'], accessToken, videoAttributes)
     } else {
-      throw err
+      console.log(err.message)
+      process.exit(1)
     }
   }
 
diff --git a/support/doc/dependencies.md b/support/doc/dependencies.md
index 6db8a57d0..ab7fb2e4e 100644
--- a/support/doc/dependencies.md
+++ b/support/doc/dependencies.md
@@ -46,15 +46,19 @@ $ sudo pacman -S nodejs yarn ffmpeg postgresql openssl redis git wget unzip pyth
   2. Install yarn:
      [https://yarnpkg.com/en/docs/install](https://yarnpkg.com/en/docs/install)
   3. Install or compile ffmpeg:
-     * Install - [https://www.webfoobar.com/index.php/node/17](https://www.webfoobar.com/index.php/node/17)
+     * Install - [https://linoxide.com/linux-how-to/install-ffmpeg-centos-7/](https://linoxide.com/linux-how-to/install-ffmpeg-centos-7/)
      * Compile - [https://gist.github.com/mustafaturan/7053900#file-latest-ffmpeg-centos6-sh](https://gist.github.com/mustafaturan/7053900#file-latest-ffmpeg-centos6-sh)
   4. Run:
 
 ```
 $ sudo yum update
-$ sudo yum install epel-release
+$ sudo yum install epel-release centos-release-scl
 $ sudo yum update
-$ sudo yum install nginx postgresql postgresql-server openssl gcc make redis git
+$ sudo yum install nginx postgresql postgresql-server openssl gcc-c++ make redis git devtoolset-6
+```
+
+  5. You need to use a more up to date version of G++ in order to run the yarn install command, hence the installation of devtoolset-6.
+$ sudo scl devtoolset-6 bash
 ```
 
 ## Other distributions
diff --git a/support/doc/production.md b/support/doc/production.md
index 3a58811b0..313b57889 100644
--- a/support/doc/production.md
+++ b/support/doc/production.md
@@ -51,7 +51,11 @@ $ sudo -u peertube wget -q "https://github.com/Chocobozzz/PeerTube/releases/down
 $ sudo -u peertube unzip peertube-${VERSION}.zip && sudo -u peertube rm peertube-${VERSION}.zip
 ```
 
-Install Peertube
+Install Peertube. If you're using CentOS7, do not forget to activate the devtoolset-6 software collection:
+```
+$ scl enable devtool-6 bash
+```
+And after that, follow the step as usual. Do not forget to exit the environment after installing Peertube.
 ```
 $ cd ../ && sudo -u peertube ln -s versions/peertube-${VERSION} ./peertube-latest
 $ cd ./peertube-latest && sudo -H -u peertube yarn install --production --pure-lockfile