1 files changed, 24 insertions, 6 deletions
diff --git a/SendGrid/SendGrid/Helpers/Mail/Personalization.cs b/SendGrid/SendGrid/Helpers/Mail/Personalization.cs
index fbab22d..21e9c76 100644
--- a/SendGrid/SendGrid/Helpers/Mail/Personalization.cs
+++ b/SendGrid/SendGrid/Helpers/Mail/Personalization.cs
@@ -6,56 +6,74 @@ namespace SendGrid.Helpers.Mail
     public class Personalization
     {
         [JsonProperty(PropertyName = "to")]
-        public List<Email> Tos { get; set; } = new List<Email>();
+        public List<Email> Tos { get; set; }
 
         [JsonProperty(PropertyName = "cc")]
-        public List<Email> Ccs { get; set; } = new List<Email>();
+        public List<Email> Ccs { get; set; }
 
         [JsonProperty(PropertyName = "bcc")]
-        public List<Email> Bccs { get; set; } = new List<Email>();
+        public List<Email> Bccs { get; set; }
 
         [JsonProperty(PropertyName = "subject")]
         public string Subject { get; set; }
 
         [JsonProperty(PropertyName = "headers")]
-        public Dictionary<string, string> Headers { get; set; } = new Dictionary<string, string>();
+        public Dictionary<string, string> Headers { get; set; }
 
         [JsonProperty(PropertyName = "substitutions")]
-        public Dictionary<string, string> Substitutions { get; set; } = new Dictionary<string, string>();
+        public Dictionary<string, string> Substitutions { get; set; }
 
         [JsonProperty(PropertyName = "custom_args")]
-        public Dictionary<string, string> CustomArgs { get; set; } = new Dictionary<string, string>();
+        public Dictionary<string, string> CustomArgs { get; set; }
 
         [JsonProperty(PropertyName = "send_at")]
         public long SendAt { get; set; }
 
         public void AddTo(Email email)
         {
+            if (Tos == null)
+                Tos = new List<Email>();
+
             Tos.Add(email);
         }
 
         public void AddCc(Email email)
         {
+            if (Ccs == null)
+                Ccs = new List<Email>();
+
             Ccs.Add(email);
         }
 
         public void AddBcc(Email email)
         {
+            if (Bccs == null)
+                Bccs = new List<Email>();
+
             Bccs.Add(email);
         }
 
         public void AddHeader(string key, string value)
         {
+            if (Headers == null)
+                Headers = new Dictionary<string, string>();
+
             Headers.Add(key, value);
         }
 
         public void AddSubstitution(string key, string value)
         {
+            if (Substitutions == null)
+                Substitutions = new Dictionary<string, string>();
+
             Substitutions.Add(key, value);
         }
 
         public void AddCustomArgs(string key, string value)
         {
+            if (CustomArgs == null)
+                CustomArgs = new Dictionary<string, string>();
+
             CustomArgs.Add(key, value);
         }
     }