From ba57cf3f5cf33a9718f63371db0943f53f7ee421 Mon Sep 17 00:00:00 2001
From: "oliver@citruslime.com" <oliver@citruslime.com>
Date: Mon, 6 Mar 2023 11:43:38 +0000
Subject: [PATCH] Added handling for empty extension parameters in
 ImageFormatManager.TryFindFormatByFileExtension

---
 src/ImageSharp/Formats/ImageFormatManager.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/ImageSharp/Formats/ImageFormatManager.cs b/src/ImageSharp/Formats/ImageFormatManager.cs
index eaf98a4a3..62c57c026 100644
--- a/src/ImageSharp/Formats/ImageFormatManager.cs
+++ b/src/ImageSharp/Formats/ImageFormatManager.cs
@@ -102,9 +102,12 @@ public class ImageFormatManager
     /// <returns><see langword="true"/> if a match is found; otherwise, <see langword="false"/></returns>
     public bool TryFindFormatByFileExtension(string extension, [NotNullWhen(true)] out IImageFormat? format)
     {
-        if (extension[0] == '.')
+        if (!string.IsNullOrWhiteSpace(extension))
         {
-            extension = extension[1..];
+            if (extension[0] == '.')
+            {
+                extension = extension[1..];
+            }
         }
 
         format = this.imageFormats.FirstOrDefault(x =>