diff --git a/NadekoBot/Classes/Permissions/PermissionChecker.cs b/NadekoBot/Classes/Permissions/PermissionChecker.cs
index da173a0d..7b8a5c09 100644
--- a/NadekoBot/Classes/Permissions/PermissionChecker.cs
+++ b/NadekoBot/Classes/Permissions/PermissionChecker.cs
@@ -5,6 +5,7 @@ using Discord;
 using Discord.Commands;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.Linq.Expressions;
 using NadekoBot.Classes.JSONModels;
 
 namespace NadekoBot.Classes.Permissions {
@@ -98,9 +99,14 @@ namespace NadekoBot.Classes.Permissions {
                 return false;
             } catch (Exception ex) {
                 Console.WriteLine($"Exception in canrun: {ex}");
-                ServerPermissions perms;
-                if (PermissionsHandler.PermissionsDict.TryGetValue(user.Server.Id, out perms) && perms.Verbose) //if verbose - print errors
-                    error = ex.Message;
+                try {
+                    ServerPermissions perms;
+                    if (PermissionsHandler.PermissionsDict.TryGetValue(user.Server.Id, out perms) && perms.Verbose)
+                        //if verbose - print errors
+                        error = ex.Message;
+                } catch (Exception ex2) {
+                    Console.WriteLine($"SERIOUS PERMISSION ERROR {ex2}\n\nUser:{user} Server: {user?.Server?.Name}/{user?.Server?.Id}");
+                }
                 return false;
             }
         }
diff --git a/NadekoBot/Classes/Permissions/PermissionsHandler.cs b/NadekoBot/Classes/Permissions/PermissionsHandler.cs
index f0994752..114a0d8a 100644
--- a/NadekoBot/Classes/Permissions/PermissionsHandler.cs
+++ b/NadekoBot/Classes/Permissions/PermissionsHandler.cs
@@ -72,10 +72,6 @@ namespace NadekoBot.Classes.Permissions {
         internal static PermissionBanType GetPermissionBanType(Command command, User user, Channel channel) {
             var server = user.Server;
             ServerPermissions serverPerms = PermissionsDict.GetOrAdd(server.Id, id => new ServerPermissions(id, server.Name));
-            if (!PermissionsDict.TryGetValue(server.Id, out serverPerms)) {
-                serverPerms = new ServerPermissions(server.Id, server.Name);
-                PermissionsDict.TryAdd(server.Id, serverPerms);
-            }
             bool val;
             Permissions perm;
             //server
@@ -183,7 +179,7 @@ namespace NadekoBot.Classes.Permissions {
             if (modules.ContainsKey(moduleName))
                 modules[moduleName] = value;
             else
-                modules.Add(moduleName, value);
+                modules.TryAdd(moduleName, value);
             Task.Run(() => WriteServerToJson(serverPerms));
         }
 
@@ -195,7 +191,7 @@ namespace NadekoBot.Classes.Permissions {
             if (commands.ContainsKey(commandName))
                 commands[commandName] = value;
             else
-                commands.Add(commandName, value);
+                commands.TryAdd(commandName, value);
             Task.Run(() => WriteServerToJson(serverPerms));
         }
 
@@ -213,7 +209,7 @@ namespace NadekoBot.Classes.Permissions {
             if (modules.ContainsKey(moduleName))
                 modules[moduleName] = value;
             else
-                modules.Add(moduleName, value);
+                modules.TryAdd(moduleName, value);
             Task.Run(() => WriteServerToJson(serverPerms));
         }
 
@@ -230,7 +226,7 @@ namespace NadekoBot.Classes.Permissions {
             if (commands.ContainsKey(commandName))
                 commands[commandName] = value;
             else
-                commands.Add(commandName, value);
+                commands.TryAdd(commandName, value);
             Task.Run(() => WriteServerToJson(serverPerms));
         }
 
@@ -247,7 +243,7 @@ namespace NadekoBot.Classes.Permissions {
             if (modules.ContainsKey(moduleName))
                 modules[moduleName] = value;
             else
-                modules.Add(moduleName, value);
+                modules.TryAdd(moduleName, value);
             Task.Run(() => WriteServerToJson(serverPerms));
         }
 
@@ -264,7 +260,7 @@ namespace NadekoBot.Classes.Permissions {
             if (commands.ContainsKey(commandName))
                 commands[commandName] = value;
             else
-                commands.Add(commandName, value);
+                commands.TryAdd(commandName, value);
             Task.Run(() => WriteServerToJson(serverPerms));
         }
 
@@ -281,7 +277,7 @@ namespace NadekoBot.Classes.Permissions {
             if (modules.ContainsKey(moduleName))
                 modules[moduleName] = value;
             else
-                modules.Add(moduleName, value);
+                modules.TryAdd(moduleName, value);
             Task.Run(() => WriteServerToJson(serverPerms));
         }
 
@@ -297,7 +293,7 @@ namespace NadekoBot.Classes.Permissions {
             if (commands.ContainsKey(commandName))
                 commands[commandName] = value;
             else
-                commands.Add(commandName, value);
+                commands.TryAdd(commandName, value);
             Task.Run(() => WriteServerToJson(serverPerms));
         }
 
@@ -369,11 +365,11 @@ namespace NadekoBot.Classes.Permissions {
         /// <summary>
         /// Module name with allowed/disallowed
         /// </summary>
-        public Dictionary<string, bool> Modules { get; set; }
+        public ConcurrentDictionary<string, bool> Modules { get; set; }
         /// <summary>
         /// Command name with allowed/disallowed
         /// </summary>
-        public Dictionary<string, bool> Commands { get; set; }
+        public ConcurrentDictionary<string, bool> Commands { get; set; }
         /// <summary>
         /// Should the bot filter invites to other discord servers (and ref links in the future)
         /// </summary>
@@ -385,8 +381,8 @@ namespace NadekoBot.Classes.Permissions {
 
         public Permissions(string name) {
             Name = name;
-            Modules = new Dictionary<string, bool>();
-            Commands = new Dictionary<string, bool>();
+            Modules = new ConcurrentDictionary<string, bool>();
+            Commands = new ConcurrentDictionary<string, bool>();
             FilterInvites = false;
             FilterWords = false;
         }
diff --git a/NadekoBot/bin/Debug/data/config_example.json b/NadekoBot/bin/Debug/data/config_example.json
index 0c62be7a..e4258799 100644
--- a/NadekoBot/bin/Debug/data/config_example.json
+++ b/NadekoBot/bin/Debug/data/config_example.json
@@ -2,7 +2,6 @@
   "DontJoinServers": false,
   "ForwardMessages": true,
   "IsRotatingStatus": false,
-  "SendPrivateMessageOnMention": false,
   "ObservingStreams": [],
   "RotatingStatuses": [],
   "CommandPrefixes": {