Minor correction

[melted] / mlt++ / src / MltService.cpp

diff --git a/mlt++/src/MltService.cpp b/mlt++/src/MltService.cpp
index 63509f4..078a289 100644 (file)
--- a/mlt++/src/MltService.cpp
+++ b/mlt++/src/MltService.cpp
@@ -109,6 +109,7 @@ int Service::detach( Filter &filter )
 
 Filter *Service::filter( int index )
 {
-       return new Filter( mlt_service_filter( get_service( ), index ) );
+       mlt_filter result = mlt_service_filter( get_service( ), index );
+       return result == NULL ? NULL : new Filter( result );
 }