sys.sp_fulltext_load_thesaurus_file fails sometimes due to error by Michael Zilberstein

Caught following error messages in SQL Server error log:
Procedure sp_fulltext_load_thesaurus_file, Line 41, Message: The data type of substitution parameter 1 does not match the expected type of the format specification.

sys.sp_fulltext_load_thesaurus_file contains following code block (@lcid is input variable to the procedure, its datatype is INT):

    IF (@thesaurusFilePath IS NULL)
    BEGIN
        RAISERROR(30048, 16, 1, @lcid)
    END

Simple execution of the following code fails:
DECLARE @lcid INT =15;
RAISERROR(30048, 16, 1, @lcid);

Error message is:
Msg 2786, Level 16, State 1, Line 2
The data type of substitution parameter 1 does not match the expected type of the format specification.

And indeed, if we query sys.messages for message_id = 30048, we'll see that it expects 2 substitute variables, first of them string and only second int. So following code works fine:

DECLARE @lcid INT =15
RAISERROR(30048, 16, 1, 'abcd', @lcid)

Checked the issue for SQL Server 2008 R2 SP2 and for SQL Server 2012 - same bug in both.