Set watched explorers/inspectors to null upon closing.

Wrappers/WatchedExplorer.cs

@@ -179,6 +179,7 @@ namespace pEp
         private void Explorer_Close()
         {
             Globals.ThisAddIn.RemoveFromWatchedExplorers(this);
+            this.Explorer = null;
             this.Dispose();
         }
 

Wrappers/WatchedInspector.cs

@@ -48,7 +48,7 @@ namespace pEp
         public Outlook.Inspector Inspector { get; private set; } = null;
 
         /// <summary>
-        /// Gets the Inspector that is wrapped by this WatchedInspector.
+        /// Gets the Watched Inspector.
         /// </summary>
         public override dynamic Window
         {
@@ -109,7 +109,6 @@ namespace pEp
             if (this.Inspector != null)
             {
                 ((Outlook.InspectorEvents_10_Event)this.Inspector).Close -= WatchedInspector_Close;
-
             }
         }
 
@@ -128,6 +127,7 @@ namespace pEp
         private void WatchedInspector_Close()
         {
             Globals.ThisAddIn.RemoveFromWatchedInspectors(this);
+            this.Inspector = null;
             this.Dispose();
         }