diff --git a/Lib/idlelib/IOBinding.py b/Lib/idlelib/IOBinding.py
index d20c708..eb7f97b 100644
--- a/Lib/idlelib/IOBinding.py
+++ b/Lib/idlelib/IOBinding.py
@@ -156,7 +156,8 @@
                 self.filename_change_hook()
 
     def open(self, event=None, editFile=None):
-        if self.editwin.flist:
+        flist = self.editwin.flist
+        if flist:
             if not editFile:
                 filename = self.askopenfile()
             else:
@@ -167,16 +168,22 @@
                 # we open a new window.  But we won't replace the
                 # shell window (which has an interp(reter) attribute), which
                 # gets set to "not modified" at every new prompt.
+                # Also, make sure the current window has not been closed,
+                # since it can be closed during the Open File dialog.
                 try:
                     interp = self.editwin.interp
                 except AttributeError:
                     interp = None
-                if not self.filename and self.get_saved() and not interp:
-                    self.editwin.flist.open(filename, self.loadfile)
+
+                if self.editwin and not self.filename and \
+                          self.get_saved() and not interp:
+                    flist.open(filename, self.loadfile)
                 else:
-                    self.editwin.flist.open(filename)
+                    flist.open(filename)
             else:
-                self.text.focus_set()
+                if self.text:
+                    self.text.focus_set()
+            
             return "break"
         #
         # Code for use outside IDLE:
diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
index 74a37db..edb4f37 100644
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -1435,7 +1435,8 @@
     if tkversionwarning:
         shell.interp.runcommand(''.join(("print('", tkversionwarning, "')")))
 
-    root.mainloop()
+    while flist.inversedict:  # keep IDLE running while files are open.
+        root.mainloop()
     root.destroy()
 
 if __name__ == "__main__":
diff --git a/Misc/NEWS b/Misc/NEWS
index 98e52b0..4cafa5d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -67,6 +67,9 @@
 Library
 -------
 
+- Issue #10365: File open dialog now works instead of crashing
+  even when parent window is closed. Patch by Roger Serwy.
+
 - Issue #14876: Use user-selected font for highlight configuration.
 
 - Issue #14920: Fix the help(urllib.parse) failure on locale C on terminals.