Catching InvalidCastExceptions when getting the host application in order to not blow up.

Author: MDoerner

Rubberduck.VBEEditor/SafeComWrappers/Abstract/HostApplicationBase.cs

@@ -1,4 +1,5 @@
-using System.Runtime.InteropServices;
+using System;
+using System.Runtime.InteropServices;
 
 namespace Rubberduck.VBEditor.SafeComWrappers.Abstract
 {
@@ -23,12 +24,18 @@ private static TApplication ApplicationFromComReflection(string applicationName)
             TApplication application;
             try
             {
-                application = (TApplication)Marshal.GetActiveObject($"{applicationName}.Application");
+                application = (TApplication) Marshal.GetActiveObject($"{applicationName}.Application");
             }
             catch (COMException)
             {
                 application = null; // unit tests don't need it anyway.
             }
+            catch (InvalidCastException exception)
+            {
+                //TODO: Find out why this ever happens.
+                _logger.Error(exception, $"Unable to cast the host Application {applicationName} to its PIA type.");
+                application = null; //We currently really only use the name anyway.
+            }
             return application;
         }
 
@@ -52,6 +59,11 @@ private static TApplication ApplicationFromVbe(IVBE vbe, string applicationName)
             {
                 application = null; // unit tests don't need it anyway.
             }
+            catch (InvalidCastException exception)
+            {
+                _logger.Error(exception, $"Unable to cast the host Application {applicationName} to its PIA type.");
+                application = null; //We currently really only use the name anyway.
+            }
             return application;
         }