Only try to wrap the element if it's not disconnected, fixed #3828.

src/core.js

@@ -206,20 +206,22 @@ jQuery.fn = jQuery.prototype = {
 	},
 
 	wrapAll: function( html ) {
-		if ( this[0] )
+		if ( this[0] ) {
 			// The elements to wrap the target around
-			jQuery( html, this[0].ownerDocument )
-				.clone()
-				.insertBefore( this[0] )
-				.map(function(){
-					var elem = this;
-
-					while ( elem.firstChild )
-						elem = elem.firstChild;
-
-					return elem;
-				})
-				.append(this);
+			var wrap = jQuery( html, this[0].ownerDocument ).clone();
+
+			if ( this[0].parentNode )
+				wrap.insertBefore( this[0] );
+
+			wrap.map(function(){
+				var elem = this;
+
+				while ( elem.firstChild )
+					elem = elem.firstChild;
+
+				return elem;
+			}).append(this);
+		}
 
 		return this;
 	},

test/unit/core.js

@@ -751,7 +751,7 @@ test("text()", function() {
 });
 
 test("wrap(String|Element)", function() {
-	expect(8);
+	expect(10);
 	var defaultText = 'Try them out:'
 	var result = jQuery('#first').wrap('<div class="red"><span></span></div>').text();
 	equals( defaultText, result, 'Check for wrapping of on-the-fly html' );
@@ -776,6 +776,11 @@ test("wrap(String|Element)", function() {
 	j.wrap("<i></i>");
 	equals( jQuery("#nonnodes > i").length, 3, "Check node,textnode,comment wraps ok" );
 	equals( jQuery("#nonnodes > i").text(), j.text() + j[1].nodeValue, "Check node,textnode,comment wraps doesn't hurt text" );
+
+	// Try wrapping a disconnected node
+	j = jQuery("<label/>").wrap("<li/>");
+	equals( j[0].nodeName, "LABEL", "Element is a label" );
+	equals( j[0].parentNode.nodeName, "LI", "Element has been wrapped" );
 });
 
 test("wrapAll(String|Element)", function() {