Diff of /plugins/playback/PlayBackPlugin.cpp [c1aa87] .. [981634] Maximize Restore

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--- a/plugins/playback/PlayBackPlugin.cpp
+++ b/plugins/playback/PlayBackPlugin.cpp
@@ -405,8 +405,10 @@
     if (!playback_params) {
 	// use default parameters if none given
 	params          = m_playback_params;
-	params.rate     = fileInfo().rate();
-	params.channels = selectedTracks().count();
+	if (!signalManager().isClosed() && !signalManager().isEmpty()) {
+	    params.rate     = fileInfo().rate();
+	    params.channels = selectedTracks().count();
+	}
     } else {
 	// use given parameters
 	params = *playback_params;