fixes #457

src/client/ui/templates/inventory/inventory.js

@@ -206,7 +206,7 @@ define([
 
 					var hoverCellItem = this.hoverCell.data('item');
 					if (hoverCellItem) {
-						if (hoverCellItem.name != this.dragItem.data('item').name) {
+						if ((hoverCellItem.name != this.dragItem.data('item').name) || (!hoverCellItem.quantity)) {
 							msgs.push({
 								id: hoverCellItem.id,
 								pos: this.hoverCell.index()

src/server/components/auth.js

@@ -258,6 +258,9 @@ define([
 		},
 
 		verifySkin: function (character) {
+			if (!character)
+				return;
+
 			var list = [...this.skins, ...roles.getSkins(this.username)];
 			var skinList = skins.getSkinList(list);