additional fix for mods with weird callbacks

AdjustableModPanel.version

@@ -9,22 +9,22 @@
     "VERSION": {
         "MAJOR": 1,
         "MINOR": 5,
-        "PATCH": 4,
+        "PATCH": 5,
         "BUILD": 0
     },
     "KSP_VERSION": {
         "MAJOR": 1,
-        "MINOR": 8,
+        "MINOR": 9,
         "PATCH": 0
     },
     "KSP_VERSION_MIN": {
         "MAJOR": 1,
-        "MINOR": 8,
+        "MINOR": 9,
         "PATCH": 0
     },
     "KSP_VERSION_MAX": {
         "MAJOR": 1,
-        "MINOR": 8,
+        "MINOR": 9,
         "PATCH": 99
     }
 }

ModPanelComponent.cs

@@ -140,8 +140,14 @@ public void Update () {
         if (texture == null)
           continue;
 
-        var func = button.onTrue.GetInvocationList ()[1];
-        var method = func.Method.Name;
+        // try any non-null callback in order
+        var func = new Callback[] { button.onTrue, button.onHover, button.onLeftClick, button.onEnable, button.onFalse, button.onHoverOut, button.onDisable }
+          .Select(cb => cb.GetInvocationList().Skip(1).FirstOrDefault()).Where(m => m != null).FirstOrDefault(); var method = func.Method.Name;
+
+        // button with no callbacks. Ignore.
+        if (func == null)
+          continue;
+
         var module = func.Method.Module.Name;
         if (module.EndsWith (".dll"))
           module = module.Substring (0, module.Length - 4);

Properties/AssemblyInfo.cs

@@ -32,5 +32,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.5.4.0")]
-[assembly: AssemblyFileVersion("1.5.4.0")]
+[assembly: AssemblyVersion("1.5.5.0")]
+[assembly: AssemblyFileVersion("1.5.5.0")]