diff --git a/cacio-tta/src/main/java/com/github/caciocavallosilano/cacio/ctc/CTCClipboard.java b/cacio-tta/src/main/java/com/github/caciocavallosilano/cacio/ctc/CTCClipboard.java
index acfa7e0..5c44275 100644
--- a/cacio-tta/src/main/java/com/github/caciocavallosilano/cacio/ctc/CTCClipboard.java
+++ b/cacio-tta/src/main/java/com/github/caciocavallosilano/cacio/ctc/CTCClipboard.java
@@ -77,7 +77,8 @@ private static void querySystemClipboard() {
     private static void systemClipboardDataReceived(String clipboardData, String clipboardDataMime) {
         synchronized(sSyncLock) {
             lastClipboardCheckTime = System.currentTimeMillis();
-            INSTANCE.contents = new CTCStringTransferable(clipboardData, clipboardDataMime);
+            if(clipboardData != null && clipboardDataMime != null)
+                INSTANCE.contents = new CTCStringTransferable(clipboardData, clipboardDataMime);
             sSyncLock.notifyAll();
         }
     }