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				@@ -403,6 +403,14 @@ namespace MediaBrowser.Server.Implementations.Connect 
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				         public async Task<UserLinkResult> LinkUser(string userId, string connectUsername) 
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				         { 
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				+            if (string.IsNullOrWhiteSpace(userId)) 
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				+            { 
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				+                throw new ArgumentNullException("userId"); 
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				+            } 
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				+            if (string.IsNullOrWhiteSpace(connectUsername)) 
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				+            { 
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				+                throw new ArgumentNullException("connectUsername"); 
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				+            } 
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				             if (string.IsNullOrWhiteSpace(ConnectServerId)) 
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				             { 
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				                 await UpdateConnectInfo().ConfigureAwait(false); 
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				@@ -422,14 +430,6 @@ namespace MediaBrowser.Server.Implementations.Connect 
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				         private async Task<UserLinkResult> LinkUserInternal(string userId, string connectUsername) 
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				         { 
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				-            if (string.IsNullOrWhiteSpace(userId)) 
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				-            { 
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				-                throw new ArgumentNullException("userId"); 
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				-            } 
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				-            if (string.IsNullOrWhiteSpace(connectUsername)) 
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				-            { 
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				-                throw new ArgumentNullException("connectUsername"); 
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				-            } 
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				             if (string.IsNullOrWhiteSpace(ConnectServerId)) 
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				             { 
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				                 throw new ArgumentNullException("ConnectServerId"); 
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				@@ -446,6 +446,12 @@ namespace MediaBrowser.Server.Implementations.Connect 
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				                 throw new ArgumentException("The Emby account has been disabled."); 
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				             } 
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				+            var existingUser = _userManager.Users.FirstOrDefault(i => string.Equals(i.ConnectUserId, connectUser.Id) && !string.IsNullOrWhiteSpace(i.ConnectAccessKey)); 
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				+            if (existingUser != null) 
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				+            { 
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				+                throw new InvalidOperationException("This connect user is already linked to local user " + existingUser.Name); 
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				+            } 
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				+ 
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				             var user = GetUser(userId); 
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				             if (!string.IsNullOrWhiteSpace(user.ConnectUserId)) 
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