#0 src/vendor/oyejorge/less.php/lib/Less/Functions.php(663): XF::handlePhpError(8, 'Undefined prope...', '/var/www/user28...', 663, Array)
#1 src/vendor/oyejorge/less.php/lib/Less/Functions.php(733): Less_Functions->_minmax(false, Array)
#2 [internal function]: Less_Functions->max(Object(Less_Tree_Operation), Object(Less_Tree_Dimension))
#3 src/vendor/oyejorge/less.php/lib/Less/Tree/Call.php(77): call_user_func_array(Array, Array)
#4 src/vendor/oyejorge/less.php/lib/Less/Tree/Expression.php(52): Less_Tree_Call->compile(Object(Less_Environment))
#5 src/vendor/oyejorge/less.php/lib/Less/Tree/Value.php(27): Less_Tree_Expression->compile(Object(Less_Environment))
#6 src/vendor/oyejorge/less.php/lib/Less/Tree/Rule.php(75): Less_Tree_Value->compile(Object(Less_Environment))
#7 src/vendor/oyejorge/less.php/lib/Less/Tree/Ruleset.php(94): Less_Tree_Rule->compile(Object(Less_Environment))
#8 src/vendor/oyejorge/less.php/lib/Less/Parser.php(199): Less_Tree_Ruleset->compile(Object(Less_Environment))
#9 src/XF/CssRenderer.php(404): Less_Parser->getCss()
#10 src/XF/CssRenderer.php(342): XF\CssRenderer->renderToCss('public:blok_dar...', '/**** NAVIGATIO...')
#11 src/XF/CssRenderer.php(250): XF\CssRenderer->renderTemplate('public:blok_dar...', NULL)
#12 src/XF/CssRenderer.php(116): XF\CssRenderer->renderTemplates(Array, Array, Array)
#13 src/XF/CssWriter.php(53): XF\CssRenderer->render(Array)
#14 css.php(30): XF\CssWriter->run(Array, 2, 2, '13d2ddfa423809b...')
#15 {main}