From db8afe344ee076eec2a557f14437deeba559a2a0 Mon Sep 17 00:00:00 2001
From: "Veronica K. B. Olsen" <code@vkbo.net>
Date: Sun, 12 May 2019 20:13:37 +0200
Subject: [PATCH] Caught an unexpected itemclass None, but can't recreate the
 bug. Added an extra check.

---
 nw/gui/doctree.py | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/nw/gui/doctree.py b/nw/gui/doctree.py
index 4ef921f2..d448dbd0 100644
--- a/nw/gui/doctree.py
+++ b/nw/gui/doctree.py
@@ -74,6 +74,9 @@ class GuiDocTree(QTreeWidget):
 
         logger.debug("DocTree initialisation complete")
 
+        # Internal Mapping
+        self.makeAlert = self.theParent.makeAlert
+
         return
 
     ##
@@ -89,8 +92,15 @@ class GuiDocTree(QTreeWidget):
     def newTreeItem(self, itemType, itemClass):
 
         pHandle = self.getSelectedHandle()
-        if itemClass is None and pHandle is not None:
+        if pHandle is None:
+            self.makeAlert("No valid parent item selected", 2)
+            return False
+
+        if itemClass is None:
             itemClass = self.theProject.getItem(pHandle).itemClass
+        if itemClass is None:
+            self.makeAlert("Failed to find an appropriate item class for item %s" % pHandle, 2)
+            return False
 
         logger.verbose("Adding new item of type %s and class %s to handle %s" % (
             itemType.name, itemClass.name, str(pHandle))