diff --git a/src/main/java/de/mrbesen/telegram/MessageBuilder.java b/src/main/java/de/mrbesen/telegram/MessageBuilder.java
index 34629e2..d83e67c 100644
--- a/src/main/java/de/mrbesen/telegram/MessageBuilder.java
+++ b/src/main/java/de/mrbesen/telegram/MessageBuilder.java
@@ -249,16 +249,21 @@ public class MessageBuilder {
 		public static Attachment getForFileExt(String extention) {
 			if(extention.startsWith("."))
 				extention = extention.substring(1);
-
-			if(extention.equalsIgnoreCase("mp4")) {
+			
+			extention = extention.toLowerCase();
+			
+			if(extention.equals("mp4")) {
 				return Attachment.Video;
-			} else if(extention.equalsIgnoreCase("mp3")) {
+			} else if(extention.equals("mp3")) {
 				return Attachment.Audio;
-			} else if(extention.equalsIgnoreCase("ogg")) {
+			} else if(extention.equals("ogg")) {
 				return Attachment.Voice;
-			} else if(extention.equalsIgnoreCase("jpg") || extention.equalsIgnoreCase("jpeg") || extention.equalsIgnoreCase("png")) {
+			} else if(extention.equals("jpg") || extention.equals("jpeg") || extention.equals("png")) {
 				return Attachment.Photo;
+			} else if(extention.equals("gif")) {
+				return Attachment.Animation;
 			}
+			
 			return Attachment.Document;
 		}
 		
@@ -275,6 +280,4 @@ public class MessageBuilder {
 			super("The Object " + missing_obj + " is missing or invalid.");
 		}
 	}
-
-
 }
diff --git a/src/main/java/de/mrbesen/telegram/TelegramAPI.java b/src/main/java/de/mrbesen/telegram/TelegramAPI.java
index 4256c77..9436222 100644
--- a/src/main/java/de/mrbesen/telegram/TelegramAPI.java
+++ b/src/main/java/de/mrbesen/telegram/TelegramAPI.java
@@ -188,7 +188,7 @@ public class TelegramAPI implements Runnable {
 	}
 
 	/**
-	 * creates internal APIEror, when message is not modyfied! TODO; run update Caption with MessageBuilder and catch that error 
+	 * creates internal APIEror, when message is not modyfied!
 	 * @param newCaption
 	 * @param chatid
 	 * @param msg_id
@@ -203,7 +203,21 @@ public class TelegramAPI implements Runnable {
 				rply = "&reply_markup=" +  URLEncoder.encode(rm.toJSONString(), "UTF-8");
 			String q = "chat_id=" + chatid + "&message_id=" + msg_id + "&caption=" + URLEncoder.encode(newCaption, "UTF-8") + rply;
 			if(async) {
-				this.async.enque("editMessageCaption", q);
+				Task t = new Task("editMessageCaption", q);
+				t.setExceptionhandl(new Callback<Throwable, Void>() {
+					@Override
+					public Void call(Throwable j) throws Throwable {
+						if(j instanceof APIError) {
+							String errmsg = ((APIError) j).getMessage();
+							if(errmsg.equals("Bad Request: message is not modified") || errmsg.equals("Bad Request: message to edit not found")) {
+								//both have code 400
+								return null;
+							}
+						}
+						throw j;
+					}
+				});
+				this.async.enque(t);
 			} else {
 				request("editMessageCaption", q);
 			}