DistributedCacheStateDataFormatter should handle failed Unprotect wor…

…kflows #2533
IdentityServer · Aug 9, 2018 · 664eebe · 664eebe
1 parent 5019ff7
commit 664eebe
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/Infrastructure/DistributedCacheStateDataFormatter.cs b/src/Infrastructure/DistributedCacheStateDataFormatter.cs
@@ -92,6 +92,11 @@ public AuthenticationProperties Unprotect(string protectedText, string purpose)
             var cacheKey = $"{CacheKeyPrefix}-{purpose}-{key}";
             var json = Cache.GetString(cacheKey);
 
+            if (json == null)
+            {
+                return null;
+            }
+
             return ObjectSerializer.FromString<AuthenticationProperties>(json);
         }
     }