@@ -, +, @@ 
    fix Bug #36645
--- a/ucs-4.0-0/management/univention-management-console-frontend/umc/widgets/GalleryPane.js	
+++ a/ucs-4.0-0/management/univention-management-console-frontend/umc/widgets/GalleryPane.js	
@@ -305,6 +305,7 @@ define([
 				this._resizeDeferred.cancel();
 			}
 			this._resizeDeferred = tools.defer(lang.hitch(this, '_resizeItemNames'), 200);
+			this._resizeDeferred.otherwise(function() { /* prevent logging of exception */ });
 		},
 
 		isLeftToRight: function() {
--- a/ucs-4.0-0/management/univention-management-console-frontend/umc/widgets/Grid.js	
+++ a/ucs-4.0-0/management/univention-management-console-frontend/umc/widgets/Grid.js	
@@ -345,6 +345,7 @@ define([
 			this._resizeDeferred = tools.defer(lang.hitch(this, function() {
 				this._grid.resize();
 			}), 200);
+			this._resizeDeferred.otherwise(function() { /* prevent logging of exception */ });
 		},
 
 		setColumnsAndActions: function(columns, actions) {