avoid delivering NaN's when setting up a generic plugin UI

git-svn-id: svn://localhost/ardour2/branches/3.0@8116 d708f5d6-7413-0410-9779-e7cbd77b26cf

diff --git a/gtk2_ardour/generic_pluginui.cc b/gtk2_ardour/generic_pluginui.cc
index ca9fd2714929318b96399297aec0ffb43612d1f5..99969e1b611d00a7a93aef847a597cd210f0079c 100644 (file)
--- a/gtk2_ardour/generic_pluginui.cc
+++ b/gtk2_ardour/generic_pluginui.cc
@@ -527,7 +527,12 @@ GenericPluginUI::build_control_ui (guint32 port_index, boost::shared_ptr<Automat
                }
 
                if (control_ui->logarithmic) {
-                       adj->set_value(log(plugin->get_parameter(port_index)));
+                        double val = plugin->get_parameter (port_index);
+                        if (isnan (val) || val <= 0.0) {
+                                adj->set_value (0.0);
+                        } else {
+                                adj->set_value (log(val));
+                        }
                } else{
                        adj->set_value(plugin->get_parameter(port_index));
                }