diff --git a/libs/ardour/lua_api.cc b/libs/ardour/lua_api.cc
index c6e5a1c228..6f85656fc4 100644
--- a/libs/ardour/lua_api.cc
+++ b/libs/ardour/lua_api.cc
@@ -830,7 +830,9 @@ LuaAPI::Vamp::analyze (boost::shared_ptr<ARDOUR::Readable> r, uint32_t channel,
 		features = _plugin->process (bufs, ::Vamp::RealTime::fromSeconds ((double) pos / _sample_rate));
 
 		if (cb.type () == LUA_TFUNCTION) {
-			cb (&features, pos);
+			if (cb (&features, pos)) {
+				break;
+			}
 		}
 
 		pos += std::min (_stepsize, to_read);