diff --git a/xmlapi/sysvarlist.cgi b/xmlapi/sysvarlist.cgi
index 9c05eea..58432b1 100755
--- a/xmlapi/sysvarlist.cgi
+++ b/xmlapi/sysvarlist.cgi
@@ -48,8 +48,14 @@ if {[info exists sid] && [check_session $sid]} {
       if (sShowText == "true") {
               Write("' value_text='"); WriteXML( oSysVar.ValueList().StrValueByIndex(';', oSysVar.Value()));
       }
-      Write("' min='"); WriteXML( oSysVar.ValueMin());
-      Write("' max='"); WriteXML( oSysVar.ValueMax());
+      Write("' min='");
+      if (oSysVar.ValueType() == 4) {
+              WriteXML( oSysVar.ValueMin());
+      }
+      Write("' max='");
+      if (oSysVar.ValueType() == 4) {
+              WriteXML( oSysVar.ValueMax());
+      }
       Write("' unit='"); WriteXML( oSysVar.ValueUnit());
       Write("' type='"); WriteXML( oSysVar.ValueType());
       Write("' subtype='"); WriteXML( oSysVar.ValueSubType());