Moved the clickable button and got the following error [1].
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Coconuts tries to choose flying mounts  during battles instead of switching back to ground mounts.
// I think checking what GetWintergraspWaitTime() returns might solve the issue. If its 'nil' a battle is currently running. Hope that helps but there is maybe a better solution.
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[1]
[2009/09/17 20:02:28-4990-x1]: LibLordFarlander-UI-2.0-90154:522: attempt to index field 'class' (a nil value)
CallbackHandler-1.0-3:156: in function <...end\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:156
<string>:"safecall Dispatcher[7]":4: in function <[string "safecall Dispatcher[7]"]:4>
<in C code>: ?
<string>:"safecall Dispatcher[7]":13: in function `?'
CallbackHandler-1.0-3:91: in function `Fire'
LibStickyFrames-2.0-90037:1144: in function `StopFrameMoving'
LibLordFarlander-UI-2.0-90154:515: in function <...\LibLordFarlander-UI-2.0\LibLordFarlander-UI-2.0.lua:507