After installing the package I went to resave existing media items so to have the icon applied. Saving fails and the logs shows this error.

I'm using Umbraco 7.5.3.

 2016-10-20 13:16:30,614 [P16628/D9/T713] ERROR Umbraco.Core.Persistence.UmbracoDatabase - Database exception occurred
System.Data.SqlClient.SqlException (0x80131904): Cannot insert duplicate key row in object 'dbo.cmsPropertyData' with unique index 'IX_cmsPropertyData_1'. The duplicate key value is (2940, 5202841a-5628-4b18-baaa-d0a8d361ac41, 25).
The statement has been terminated.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
   at System.Data.SqlClient.SqlDataReader.get_MetaData()
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds, Boolean describeParameterEncryptionRequest)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteScalar()
   at StackExchange.Profiling.Data.ProfiledDbCommand.ExecuteScalar() in c:\Code\github\SamSaffron\MiniProfiler\StackExchange.Profiling\Data\ProfiledDbCommand.cs:line 311
   at Umbraco.Core.Persistence.PetaPocoCommandExtensions.<>c__DisplayClassa.<ExecuteScalarWithRetry>b__9()
   at Umbraco.Core.Persistence.FaultHandling.RetryPolicy.ExecuteAction[TResult](Func`1 func)
   at Umbraco.Core.Persistence.PetaPocoCommandExtensions.ExecuteScalarWithRetry(IDbCommand command, RetryPolicy cmdRetryPolicy, RetryPolicy conRetryPolicy)
   at Umbraco.Core.Persistence.PetaPocoCommandExtensions.ExecuteScalarWithRetry(IDbCommand command, RetryPolicy retryPolicy)
   at Umbraco.Core.Persistence.PetaPocoCommandExtensions.ExecuteScalarWithRetry(IDbCommand command)
   at Umbraco.Core.Persistence.Database.Insert(String tableName, String primaryKeyName, Boolean autoIncrement, Object poco)
ClientConnectionId:ea6f6084-5ac8-4957-adbb-a5ebc672ca8b
Error Number:2601,State:1,Class:14