diff --git a/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/quickfix/AJQuickFixProcessor.java b/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/quickfix/AJQuickFixProcessor.java
index 2c5683f288..feeccfcd41 100644
--- a/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/quickfix/AJQuickFixProcessor.java
+++ b/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/quickfix/AJQuickFixProcessor.java
@@ -26,7 +26,7 @@
 import org.eclipse.jdt.ui.text.java.IProblemLocation;
 import org.eclipse.jdt.ui.text.java.IQuickAssistProcessor;
 import org.eclipse.ui.IEditorPart;
-import org.eclipse.ui.PlatformUI;
+import org.eclipse.ui.IWorkbenchWindow;
 
 /**
  * Adapted from org.eclipse.jdt.internal.ui.text.correction.QuickFixProcessor
@@ -57,7 +57,10 @@ public IJavaCompletionProposal[] getCorrections(IInvocationContext context, IPro
 
 		if (AspectJPlugin.isAJProject(project)) {
 			// We're looking at a problem in an AspectJ Project
-			IEditorPart ed = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActiveEditor();
+			IWorkbenchWindow workbenchWindow = getActiveWorkbenchWindow();
+			if (workbenchWindow == null)
+				return null;
+			IEditorPart ed = workbenchWindow.getActivePage().getActiveEditor();
 			if ((ed instanceof AspectJEditor)) {
 				// Only apply to the Java editor
 				return null;
diff --git a/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/quickfix/QuickFixProcessor.java b/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/quickfix/QuickFixProcessor.java
index b05950e4f2..8ff3564a1b 100755
--- a/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/quickfix/QuickFixProcessor.java
+++ b/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/quickfix/QuickFixProcessor.java
@@ -14,6 +14,8 @@
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashSet;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
 
 import org.eclipse.ajdt.internal.ui.editor.AspectJEditor;
 import org.eclipse.core.runtime.CoreException;
@@ -40,7 +42,9 @@
 import org.eclipse.jdt.ui.text.java.IQuickAssistProcessor;
 import org.eclipse.jdt.ui.text.java.IQuickFixProcessor;
 import org.eclipse.jdt.ui.text.java.correction.ICommandAccess;
+import org.eclipse.swt.widgets.Display;
 import org.eclipse.ui.IEditorPart;
+import org.eclipse.ui.IWorkbenchWindow;
 import org.eclipse.ui.PlatformUI;
 
 /**
@@ -229,8 +233,10 @@ public IJavaCompletionProposal[] getCorrections(IInvocationContext context, IPro
 		}
 
 		// AspectJ Change Begin
-		IEditorPart ed = PlatformUI.getWorkbench().getActiveWorkbenchWindow()
-				.getActivePage().getActiveEditor();
+		IWorkbenchWindow workbenchWindow = getActiveWorkbenchWindow();
+		if (workbenchWindow == null)
+			return null;
+		IEditorPart ed = workbenchWindow.getActivePage().getActiveEditor();
 		if (!(ed instanceof AspectJEditor)) {
 			// we only want to provide corrections for the AspectJ editor
 			// otherwise we get double completions in the Java editor
@@ -571,4 +577,19 @@ public boolean hasAssists(IInvocationContext context) throws CoreException {
         return false;
     }
     // end AspectJ Change
+
+		// begin AspectJ Change - utility method
+		public static IWorkbenchWindow getActiveWorkbenchWindow() {
+			CompletableFuture<IWorkbenchWindow> future = new CompletableFuture<>();
+			Display.getDefault().syncExec(() -> future.complete(PlatformUI.getWorkbench().getActiveWorkbenchWindow()));
+			IWorkbenchWindow workbenchWindow;
+			try {
+				workbenchWindow = future.get();
+			} catch (InterruptedException | ExecutionException e) {
+				return null;
+			}
+			return workbenchWindow;
+		}
+		// end AspectJ Change
+
 }