From a74e60a0b7f51c9f86e4d9e075b16849fb8288ef Mon Sep 17 00:00:00 2001
From: Maksim Chegulov <maksim.chegulov@onlyoffice.com>
Date: Wed, 2 Oct 2024 18:37:09 +0300
Subject: [PATCH] fix Bug 70637

---
 .../Core/Core/Security/ExternalShare.cs          | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/products/ASC.Files/Core/Core/Security/ExternalShare.cs b/products/ASC.Files/Core/Core/Security/ExternalShare.cs
index 986443c052..dea82c62ed 100644
--- a/products/ASC.Files/Core/Core/Security/ExternalShare.cs
+++ b/products/ASC.Files/Core/Core/Security/ExternalShare.cs
@@ -178,10 +178,24 @@ public string GetKey()
     
     public async Task<TokenData> ParseShareKeyAsync(string key)
     {
-        ArgumentException.ThrowIfNullOrEmpty(key);
+        if (string.IsNullOrEmpty(key))
+        {
+            return new TokenData
+            {
+                Id = Guid.Empty
+            };
+        }
 
         var stringKey = Signature.Read<string>(key, await GetDbKeyAsync());
 
+        if (string.IsNullOrEmpty(stringKey))
+        {
+            return new TokenData
+            {
+                Id = Guid.Empty
+            };
+        }
+
         if (!stringKey.StartsWith('{') || !stringKey.EndsWith('}'))
         {
             return new TokenData