diff --git a/lib.gradle b/lib.gradle
index eaefc54b7a..832ec9f8cb 100644
--- a/lib.gradle
+++ b/lib.gradle
@@ -3,7 +3,7 @@
  * Use is subject to license terms, see http://www.cuba-platform.com/license for details.
  */
 
-project.ext.vaadinVersion = '7.5.6.cuba.3'
+project.ext.vaadinVersion = '7.5.6.cuba.4'
 
 project.ext.vaadinShared = [group: 'com.vaadin', name: 'vaadin-shared', version: vaadinVersion]
 project.ext.vaadinServer = [group: 'com.vaadin', name: 'vaadin-server', version: vaadinVersion]
diff --git a/modules/web-toolkit/src/com/haulmont/cuba/web/toolkit/ui/client/grouptable/CubaGroupTableWidget.java b/modules/web-toolkit/src/com/haulmont/cuba/web/toolkit/ui/client/grouptable/CubaGroupTableWidget.java
index 28d8f0c26b..33c9fce099 100644
--- a/modules/web-toolkit/src/com/haulmont/cuba/web/toolkit/ui/client/grouptable/CubaGroupTableWidget.java
+++ b/modules/web-toolkit/src/com/haulmont/cuba/web/toolkit/ui/client/grouptable/CubaGroupTableWidget.java
@@ -394,6 +394,7 @@ public class CubaGroupTableWidget extends CubaScrollTableWidget {
             protected String groupKey;
             protected boolean expanded;
             protected Boolean hasCells;
+            protected Element expander;
 
             public CubaGroupTableGroupRow(UIDL uidl, char[] aligns) {
                 super(uidl, aligns);
@@ -578,11 +579,11 @@ public class CubaGroupTableWidget extends CubaScrollTableWidget {
 
                 container.setInnerHTML("");
 
-                Element groupDiv = DOM.createDiv();
-                groupDiv.setInnerHTML(" ");
+                expander = DOM.createDiv();
+                expander.setInnerHTML(" ");
 
-                groupDiv.setClassName(CLASSNAME + "-group-cell-expander");
-                DOM.appendChild(container, groupDiv);
+                expander.setClassName(CLASSNAME + "-group-cell-expander");
+                DOM.appendChild(container, expander);
 
                 Element contentDiv = DOM.createDiv();
                 contentDiv.setInnerHTML(containerInnerHTML);
@@ -602,7 +603,7 @@ public class CubaGroupTableWidget extends CubaScrollTableWidget {
                         }
                         setRowFocus(this);
 
-                        if (!isSingleSelectMode()) {
+                        if (event.getEventTarget().cast() != expander) {
                             deselectAll();
                             sendSelectedRows(false);
                         }
diff --git a/modules/web/src/com/haulmont/cuba/web/gui/components/WebAbstractTable.java b/modules/web/src/com/haulmont/cuba/web/gui/components/WebAbstractTable.java
index 64e74cadc1..f8cf5ad819 100644
--- a/modules/web/src/com/haulmont/cuba/web/gui/components/WebAbstractTable.java
+++ b/modules/web/src/com/haulmont/cuba/web/gui/components/WebAbstractTable.java
@@ -483,7 +483,6 @@ public abstract class WebAbstractTable<T extends com.vaadin.ui.Table & CubaEnhan
 
     protected void initComponent(final T component) {
         component.setMultiSelect(false);
-        component.setNullSelectionAllowed(false);
         component.setImmediate(true);
         component.setValidationVisible(false);
         component.setShowBufferedSourceException(false);
@@ -1342,7 +1341,6 @@ public abstract class WebAbstractTable<T extends com.vaadin.ui.Table & CubaEnhan
 
     @Override
     public void setMultiSelect(boolean multiselect) {
-        component.setNullSelectionAllowed(multiselect);
         super.setMultiSelect(multiselect);
     }