From 2b7ee2292c3a296cd17555887e3452fc8de63b7f Mon Sep 17 00:00:00 2001
From: Ivandro Jao <ivandrofly@gmail.com>
Date: Fri, 18 Jun 2021 22:38:08 +0100
Subject: [PATCH] fix zero length string replace

---
 src/libse/Common/ContinuationUtilities.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libse/Common/ContinuationUtilities.cs b/src/libse/Common/ContinuationUtilities.cs
index 2658d012d..5155671ae 100644
--- a/src/libse/Common/ContinuationUtilities.cs
+++ b/src/libse/Common/ContinuationUtilities.cs
@@ -670,7 +670,7 @@ namespace Nikse.SubtitleEdit.Core.Common
             }
             newFirstWord = newFirstWord.Trim();
 
-            string result;
+            string result = null;
 
             // If we can find it...
             if (originalText.IndexOf(firstWord, StringComparison.Ordinal) >= 0)
@@ -678,7 +678,7 @@ namespace Nikse.SubtitleEdit.Core.Common
                 // Replace it
                 result = ReplaceFirstOccurrence(originalText, firstWord, newFirstWord);
             }
-            else
+            else if (newFirstWord.Length > 0)
             {
                 // Just remove whatever prefix we need to remove
                 var prefix = firstWord.Replace(newFirstWord, "");