diff --git a/CHANGES.md b/CHANGES.md
index 7dab4384d77..7fa6c7039c5 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -27,6 +27,7 @@ Fixed Issues:
 Other Changes:
 
 * [#10903](http://dev.ckeditor.com/ticket/10903): Performance improvements for [`addClass`](http://docs.ckeditor.com/#!/api/CKEDITOR.dom.element-method-addClass), [`removeClass`](http://docs.ckeditor.com/#!/api/CKEDITOR.dom.element-method-removeClass) and [`hasClass`](http://docs.ckeditor.com/#!/api/CKEDITOR.dom.element-method-hasClass) methods.
+* [#11856](http://dev.ckeditor.com/ticket/11856): jQuery adapter throw an meaningful error if CKEditor or jQuery is not loaded.
 
 ## CKEditor 4.4.7
 
diff --git a/adapters/jquery.js b/adapters/jquery.js
index 73c31a819f6..2b5ac074f5b 100644
--- a/adapters/jquery.js
+++ b/adapters/jquery.js
@@ -19,6 +19,14 @@
  */
 
 ( function( $ ) {
+	if ( typeof $ == 'undefined' ) {
+		throw new Error( 'jQuery should be loaded before CKEditor adapter. Have you mistaken loaded scripts order?' );
+	}
+
+	if ( typeof CKEDITOR == 'undefined' ) {
+		throw new Error( 'CKEditor core should be loaded before jQuery adapter. Have you mistaken loaded scripts order?' );
+	}
+
 	/**
 	 * Allows CKEditor to override `jQuery.fn.val()`. When set to `true`, the `val()` function
 	 * used on textarea elements replaced with CKEditor uses the CKEditor API.
@@ -47,9 +55,6 @@
 			:
 				CKEDITOR.config.jqueryOverrideVal;
 
-	if ( typeof $ == 'undefined' )
-		return;
-
 	// jQuery object methods.
 	$.extend( $.fn, {
 		/**
diff --git a/tests/adapters/jquery/manual/nockeditor.html b/tests/adapters/jquery/manual/nockeditor.html
new file mode 100644
index 00000000000..8cd0556e2f0
--- /dev/null
+++ b/tests/adapters/jquery/manual/nockeditor.html
@@ -0,0 +1,3 @@
+<script>
+	delete window.CKEDITOR;
+</script>
diff --git a/tests/adapters/jquery/manual/nockeditor.md b/tests/adapters/jquery/manual/nockeditor.md
new file mode 100644
index 00000000000..ca9f021c996
--- /dev/null
+++ b/tests/adapters/jquery/manual/nockeditor.md
@@ -0,0 +1,4 @@
+@bender-ckeditor-adapters: jquery
+@bender-tags: 4.5.0, tc, jquery
+
+There should be an error telling that `CKEditor core should be loaded before jQuery adapter`.
\ No newline at end of file
diff --git a/tests/adapters/jquery/manual/nojquery.html b/tests/adapters/jquery/manual/nojquery.html
new file mode 100644
index 00000000000..3d89fe5528a
--- /dev/null
+++ b/tests/adapters/jquery/manual/nojquery.html
@@ -0,0 +1 @@
+<script src="%BASE_PATH%../apps/ckeditor/adapters/jquery.js" ></script>
\ No newline at end of file
diff --git a/tests/adapters/jquery/manual/nojquery.md b/tests/adapters/jquery/manual/nojquery.md
new file mode 100644
index 00000000000..b00ea411c9a
--- /dev/null
+++ b/tests/adapters/jquery/manual/nojquery.md
@@ -0,0 +1,3 @@
+@bender-tags: 4.5.0, tc
+
+There should be an error telling that `jQuery should be loaded before CKEditor adapter`.
\ No newline at end of file