Sql-server – Uncommitable T-SQL transaction after trigger applied to table

Good morning,
I have written a Trigger on a table that should evaluate the entered values (Length, width and Height) and based on those entered values, should update a column (Type) in the same record with a corresponding value. After applying the trigger, everything works perfectly, but at a certain time, I get the following error:

Unexpected error:The current transaction cannot be committed and
cannot support operations that write to the log file. Roll back the
transaction. The statement has been terminated

I found a thread to handle errors using Try/Catch blocks with XACT_ABORT() and XACT_STATE(), but still the same issue is happening. Again, the issue is not occuring all the time, but sometimes only.
Here is my Trigger:

CREATE TRIGGER [dbo].[UTRAfterUpdate] 
   ON  [dbo].[TBL_STOCK] 
   AFTER UPDATE
AS 
BEGIN

    SET NOCOUNT ON;


    DECLARE @CBM FLOAT, @T NVARCHAR(1);
    DECLARE C CURSOR FOR SELECT LEG_PRODUCT_ID, PR_LENGTH1, 
                         PR_WIDTH1, PR_HEIGHT1, PR_TYPE FROM INSERTED
    DECLARE @ID BIGINT, @L INT, @W INT, @H INT, @TYPE NVARCHAR(1)

    SET XACT_ABORT ON;
    BEGIN TRY
        BEGIN TRANSACTION;
        OPEN C
        FETCH NEXT FROM C INTO @ID, @L, @W, @H, @TYPE
        WHILE @@FETCH_STATUS = 0
        BEGIN
            IF(UPDATE(PR_LENGTH1) OR UPDATE (PR_WIDTH1) OR UPDATE(PR_HEIGHT1))
            BEGIN
                SET @CBM = (cast(@l AS DECIMAL(18,2))/100
                                       *cast(@w AS DECIMAL(18,2))/100
                                       *cast(@h AS DECIMAL(18,2))/100)
                SET @T = CASE 
                    WHEN (@CBM > 0.00  AND @CBM <= 13.00) 
                          AND (@h <= 170) THEN 'C'
                    WHEN (@CBM > 0.00  AND @CBM <= 13.00)
                          AND (@h >  170 AND @h <= 220) THEN 'V'                       
                    WHEN (@CBM > 13.00 AND @CBM <= 20.00)
                          AND (@h <= 220) THEN 'V'
                    WHEN (@CBM > 0.00  AND @CBM <= 20.00)
                          AND (@h >  220 AND @h <= 250) THEN 'B'                         
                    WHEN (@CBM > 20.00 AND @CBM <= 30.00)
                          AND (@h <= 250) THEN 'B' 
                    WHEN (@CBM > 0.00  AND @CBM <= 30.00)
                          AND (@h >  250) THEN 'T'
                    WHEN (@CBM > 30.00) THEN 'T'
                    ELSE @type
                END
                IF(@type <> @T)
                    UPDATE dbo.TBL_STOCK
                                    SET PR_TYPE = @t,
                                    LAST_ACTION = 'UTR',
                                    LAST_USER = 'System' 
                    FROM TBL_STOCK STOCK INNER JOIN INSERTED INS
                            ON STOCK.LEG_PRODUCT_ID = INS.LEG_PRODUCT_ID
                    WHERE STOCK.LEG_PRODUCT_ID = @id
            END
        FETCH NEXT FROM C INTO @id, @l, @w, @h, @type    
        END
        COMMIT TRANSACTION;
    END TRY
    BEGIN CATCH
        IF (XACT_STATE()) = -1
        BEGIN
            PRINT 'The transaction is in an uncommittable state.'
            + ' Rolling back transaction.'
            ROLLBACK TRANSACTION;
        END;
        IF (XACT_STATE()) = 1
        BEGIN
            PRINT 'The transaction is committable.'
            + ' Committing transaction.'
            COMMIT TRANSACTION;   
        END;
    END CATCH

CLOSE C
DEALLOCATE C
END

Can you please assist me n solving the issue?

Thanks in advance!