diff --git a/INSTALLATION.md b/INSTALLATION.md
index 17a60f7..67cb10a 100644
--- a/INSTALLATION.md
+++ b/INSTALLATION.md
@@ -127,8 +127,8 @@ sudo certbot renew --dry-run
 Make sure you're securing your firewall correctly:
 
 ```
+sudo apt install ufw #if not installed
 sudo ufw app list
-sudo ufw allow 'Nginx Full'
 sudo ufw allow 22/tcp
 sudo ufw allow 80/tcp
 sudo ufw allow 443/tcp
diff --git a/src/BirdsiteLive.Twitter/CachedTwitterService.cs b/src/BirdsiteLive.Twitter/CachedTwitterService.cs
index 3b2de8d..2f0be46 100644
--- a/src/BirdsiteLive.Twitter/CachedTwitterService.cs
+++ b/src/BirdsiteLive.Twitter/CachedTwitterService.cs
@@ -33,7 +33,7 @@ namespace BirdsiteLive.Twitter
             if (!_userCache.TryGetValue(username, out TwitterUser user))
             {
                 user = _twitterService.GetUser(username);
-                _userCache.Set(username, user, _cacheEntryOptions);
+                if(user != null) _userCache.Set(username, user, _cacheEntryOptions);
             }
 
             return user;
diff --git a/src/BirdsiteLive/BirdsiteLive.csproj b/src/BirdsiteLive/BirdsiteLive.csproj
index e09572c..ef50a52 100644
--- a/src/BirdsiteLive/BirdsiteLive.csproj
+++ b/src/BirdsiteLive/BirdsiteLive.csproj
@@ -4,7 +4,7 @@
     <TargetFramework>netcoreapp3.1</TargetFramework>
     <UserSecretsId>d21486de-a812-47eb-a419-05682bb68856</UserSecretsId>
     <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
-    <Version>0.11.1</Version>
+    <Version>0.11.2</Version>
   </PropertyGroup>
 
   <ItemGroup>