1 files changed, 2 insertions, 24 deletions
diff --git a/js/src/dom/selector-engine.js b/js/src/dom/selector-engine.js
index eb6b680ac..d66d8acfc 100644
--- a/js/src/dom/selector-engine.js
+++ b/js/src/dom/selector-engine.js
@@ -22,37 +22,22 @@ const SelectorEngine = {
   },
 
   find(selector, element = document.documentElement) {
-    if (typeof selector !== 'string') {
-      return null
-    }
-
     return findFn.call(element, selector)
   },
 
   findOne(selector, element = document.documentElement) {
-    if (typeof selector !== 'string') {
-      return null
-    }
-
     return findOne.call(element, selector)
   },
 
   children(element, selector) {
-    if (typeof selector !== 'string') {
-      return null
-    }
-
     const children = makeArray(element.children)
 
     return children.filter(child => this.matches(child, selector))
   },
 
   parents(element, selector) {
-    if (typeof selector !== 'string') {
-      return null
-    }
-
     const parents = []
+
     let ancestor = element.parentNode
 
     while (ancestor && ancestor.nodeType === Node.ELEMENT_NODE && ancestor.nodeType !== NODE_TEXT) {
@@ -67,19 +52,12 @@ const SelectorEngine = {
   },
 
   closest(element, selector) {
-    if (typeof selector !== 'string') {
-      return null
-    }
-
     return closest.call(element, selector)
   },
 
   prev(element, selector) {
-    if (typeof selector !== 'string') {
-      return null
-    }
-
     const siblings = []
+
     let previous = element.previousSibling
 
     while (previous && previous.nodeType === Node.ELEMENT_NODE && previous.nodeType !== NODE_TEXT) {