diff --git a/src/core/barcodedecoder.cpp b/src/core/barcodedecoder.cpp
index 9a3a4e96d3..2b68279c3f 100644
--- a/src/core/barcodedecoder.cpp
+++ b/src/core/barcodedecoder.cpp
@@ -133,7 +133,7 @@ void BarcodeDecoder::setVideoSink( QVideoSink *sink )
 
 void BarcodeDecoder::decodeVideoFrame( const QVideoFrame &frame )
 {
-  if ( mDecodingThread )
+  if ( mDecodingThread || !frame.isValid() )
     return;
 
   QImage image = frame.toImage();