1diff --git a/src/mp4.cpp b/src/mp4.cpp 2index c2a7238..9bb3e38 100644 3--- a/src/mp4.cpp 4+++ b/src/mp4.cpp 5@@ -870,7 +870,7 @@ MP4FileHandle MP4ReadProvider( const char* fileName, const MP4FileProvider* file 6 } 7 8 catch (...) { 9- return MP4_INVALID_TRACK_ID; 10+ return NULL; 11 } 12 } 13