diff --git a/memory/org.eclipse.cdt.debug.ui.memory.memorybrowser/src/org/eclipse/cdt/debug/ui/memory/memorybrowser/MemoryBrowser.java b/memory/org.eclipse.cdt.debug.ui.memory.memorybrowser/src/org/eclipse/cdt/debug/ui/memory/memorybrowser/MemoryBrowser.java
index 43a25c5e487..67f012ffb3d 100644
--- a/memory/org.eclipse.cdt.debug.ui.memory.memorybrowser/src/org/eclipse/cdt/debug/ui/memory/memorybrowser/MemoryBrowser.java
+++ b/memory/org.eclipse.cdt.debug.ui.memory.memorybrowser/src/org/eclipse/cdt/debug/ui/memory/memorybrowser/MemoryBrowser.java
@@ -416,7 +416,9 @@ public class MemoryBrowser extends ViewPart implements IDebugContextListener, IM
 				} catch (DebugException e1) {
 					fGotoAddressBar.handleExpressionStatus(new Status(Status.ERROR, MemoryBrowserPlugin.PLUGIN_ID, 
 							Messages.getString("MemoryBrowser.FailedToGoToAddressTitle"), e1)); //$NON-NLS-1$
-					item.dispose();
+					if (item != null) {
+						item.dispose();
+					}
 					return;
 				} 
 			} else {
diff --git a/memory/org.eclipse.cdt.debug.ui.memory.traditional/src/org/eclipse/cdt/debug/ui/memory/traditional/Rendering.java b/memory/org.eclipse.cdt.debug.ui.memory.traditional/src/org/eclipse/cdt/debug/ui/memory/traditional/Rendering.java
index fe8acb8c196..60e23b494e4 100644
--- a/memory/org.eclipse.cdt.debug.ui.memory.traditional/src/org/eclipse/cdt/debug/ui/memory/traditional/Rendering.java
+++ b/memory/org.eclipse.cdt.debug.ui.memory.traditional/src/org/eclipse/cdt/debug/ui/memory/traditional/Rendering.java
@@ -1235,7 +1235,7 @@ public class Rendering extends Composite implements IDebugEventSetListener
     
             boolean changed = false;
             
-            if(fStartHigh == null || !high.equals(fStartHigh))
+            if(fStartHigh == null || !fStartHigh.equals(high))
             {
                 fStartHigh = high;
                 changed = true;
@@ -1267,7 +1267,7 @@ public class Rendering extends Composite implements IDebugEventSetListener
     
             boolean changed = false;
             
-            if(fEndHigh == null || !high.equals(fEndHigh))
+            if(fEndHigh == null || !fEndHigh.equals(high))
             {
                 fEndHigh = high;
                 changed = true;
diff --git a/memory/org.eclipse.cdt.debug.ui.memory.transport/src/org/eclipse/cdt/debug/ui/memory/transport/actions/ExportMemoryAction.java b/memory/org.eclipse.cdt.debug.ui.memory.transport/src/org/eclipse/cdt/debug/ui/memory/transport/actions/ExportMemoryAction.java
index 075ed6150ee..1fd2464adba 100644
--- a/memory/org.eclipse.cdt.debug.ui.memory.transport/src/org/eclipse/cdt/debug/ui/memory/transport/actions/ExportMemoryAction.java
+++ b/memory/org.eclipse.cdt.debug.ui.memory.transport/src/org/eclipse/cdt/debug/ui/memory/transport/actions/ExportMemoryAction.java
@@ -99,7 +99,9 @@ public class ExportMemoryAction implements IViewActionDelegate {
 					}
 				}
 				else {
-					initialStartAddr = BigInteger.valueOf(memBlock.getStartAddress());
+					if (memBlock != null) {
+						initialStartAddr = BigInteger.valueOf(memBlock.getStartAddress());
+					}
 				}
 			}
 		}