From aeeb7db0bcdf8c5c203c40f64c7768521d2660ef Mon Sep 17 00:00:00 2001
From: Ildar Khayrutdinov <ildarkhairutdin@gmail.com>
Date: Sat, 3 Jul 2021 13:31:32 +0300
Subject: [PATCH] Double tags fixing

---
 src/ImageSharp/Formats/Tiff/TiffEncoderEntriesCollector.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/ImageSharp/Formats/Tiff/TiffEncoderEntriesCollector.cs b/src/ImageSharp/Formats/Tiff/TiffEncoderEntriesCollector.cs
index b00dcc9673..1b042eec04 100644
--- a/src/ImageSharp/Formats/Tiff/TiffEncoderEntriesCollector.cs
+++ b/src/ImageSharp/Formats/Tiff/TiffEncoderEntriesCollector.cs
@@ -244,19 +244,19 @@ namespace SixLabors.ImageSharp.Formats.Tiff
                     imageMetadata.HorizontalResolution,
                     imageMetadata.VerticalResolution);
 
-                this.Collector.Add(new ExifShort(ExifTagValue.ResolutionUnit)
+                this.Collector.AddOrReplace(new ExifShort(ExifTagValue.ResolutionUnit)
                 {
                     Value = exifValues.Item1
                 });
 
                 if (exifValues.Item2 != null && exifValues.Item3 != null)
                 {
-                    this.Collector.Add(new ExifRational(ExifTagValue.XResolution)
+                    this.Collector.AddOrReplace(new ExifRational(ExifTagValue.XResolution)
                     {
                         Value = new Rational(exifValues.Item2.Value)
                     });
 
-                    this.Collector.Add(new ExifRational(ExifTagValue.YResolution)
+                    this.Collector.AddOrReplace(new ExifRational(ExifTagValue.YResolution)
                     {
                         Value = new Rational(exifValues.Item3.Value)
                     });