diff --git a/xdoc/plugin.jelly b/xdoc/plugin.jelly
index 1096afab..05cff78b 100644
--- a/xdoc/plugin.jelly
+++ b/xdoc/plugin.jelly
@@ -179,6 +179,9 @@
         @state - expanded / collapsed / none
         -->
       <a href="${pathTool.calculateLink(link,relativePath)}">
+        <j:if test="${empty(state)}">
+          <j:set var="state" value="none"/>
+        </j:if>
         <img class="handle" src="${relativePath}/images/${state}.png" alt=""/>
         <j:if test="${empty(img)}">${name}</j:if>
         <j:if test="${!empty(img)}"><img style="border: 1px" src="${img}" title="${name}" alt="${name}"/></j:if>