* fixed *undefined* problem when used variables value with *isImportant* key.

Author: kbukum

lib/find-node-ancestor-with-selector.js

@@ -8,7 +8,7 @@ var findNodeAncestorWithSelector = function(selector, node) {
 	// Keep going until we run out of parents to search
 	// or we found the node
 	var currentNode = node;
-	while(currentNode.parent && !matchingNode) {
+	while(currentNode && currentNode.parent && !matchingNode) {
 		// A trick to get the selector split up. Generate a scope list on a clone(clean parent)
 		var currentNodeScopeList = generateScopeList(currentNode.clone(), true);