diff --git a/core/modules/contextual/js/contextual.es6.js b/core/modules/contextual/js/contextual.es6.js
index e231e80b95..8c2b1aed40 100644
--- a/core/modules/contextual/js/contextual.es6.js
+++ b/core/modules/contextual/js/contextual.es6.js
@@ -105,7 +105,7 @@
       .find('.contextual');
 
     // Early-return when there's no nesting.
-    if ($contextuals.length === 1) {
+    if ($contextuals.length <= 1) {
       return;
     }
 
diff --git a/core/modules/contextual/js/contextual.js b/core/modules/contextual/js/contextual.js
index 39daa09973..a23ac66ab3 100644
--- a/core/modules/contextual/js/contextual.js
+++ b/core/modules/contextual/js/contextual.js
@@ -64,7 +64,7 @@
   function adjustIfNestedAndOverlapping($contextual) {
     var $contextuals = $contextual.parents('.contextual-region').eq(-1).find('.contextual');
 
-    if ($contextuals.length === 1) {
+    if ($contextuals.length <= 1) {
       return;
     }
 
diff --git a/core/modules/quickedit/js/quickedit.es6.js b/core/modules/quickedit/js/quickedit.es6.js
index 3fe50076a2..c5c162d449 100644
--- a/core/modules/quickedit/js/quickedit.es6.js
+++ b/core/modules/quickedit/js/quickedit.es6.js
@@ -359,7 +359,15 @@
     // [data-quickedit-entity-id] element's data-quickedit-entity-instance-id
     // attribute.
     const entityElementSelector = `[data-quickedit-entity-id="${entityID}"]`;
-    let entityElement = $(fieldElement).closest(entityElementSelector);
+    const $entityElement = $(fieldElement).closest(entityElementSelector);
+
+    // If there are no elements returned from `entityElementSelector`
+    // throw an error. Check the browser console for this message.
+    if (!$entityElement.length) {
+      throw `Quick Edit could not associate the rendered entity field markup (with [data-quickedit-field-id="${fieldID}"]) with the corresponding rendered entity markup: no parent DOM node found with [data-quickedit-entity-id="${entityID}"]. This is typically caused by the theme's template for this entity type forgetting to print the attributes.`;
+    }
+    let entityElement = $(fieldElement).closest($entityElement);
+
     // In the case of a full entity view page, the entity title is rendered
     // outside of "the entity DOM node": it's rendered as the page title. So in
     // this case, we find the lowest common parent element (deepest in the tree)
diff --git a/core/modules/quickedit/js/quickedit.js b/core/modules/quickedit/js/quickedit.js
index f1e2431fda..e4c168970d 100644
--- a/core/modules/quickedit/js/quickedit.js
+++ b/core/modules/quickedit/js/quickedit.js
@@ -159,7 +159,12 @@
     var entityID = extractEntityID(fieldID);
 
     var entityElementSelector = '[data-quickedit-entity-id="' + entityID + '"]';
-    var entityElement = $(fieldElement).closest(entityElementSelector);
+    var $entityElement = $(fieldElement).closest(entityElementSelector);
+
+    if (!$entityElement.length) {
+      throw 'Quick Edit could not associate the rendered entity field markup (with [data-quickedit-field-id="' + fieldID + '"]) with the corresponding rendered entity markup: no parent DOM node found with [data-quickedit-entity-id="' + entityID + '"]. This is typically caused by the theme\'s template for this entity type forgetting to print the attributes.';
+    }
+    var entityElement = $(fieldElement).closest($entityElement);
 
     if (entityElement.length === 0) {
       var $lowestCommonParent = $(entityElementSelector).parents().has(fieldElement).first();