<p>I got this crash when activating the spellcheck plugin which poped up some error message dialog this dialog somehow caused that the tooltip callback got executed reading the invalid plugin pointer.</p>

<p>The patch isn't completely ideal because it causes the plugin row disappears while the error dialog is shown (is displayed again when the dialog is dismissed). However I don't see any other simple solution - it's not possible to call plugin_new() while keeping the old pointer as plugin_new() prevents that the same plugin is created twice.</p>

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