wrap the set window prop for file name in a try

addon.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <addon  id="plugin.video.emby"
         name="Emby" 
-        version="2.3.42"
+        version="2.3.43"
         provider-name="Emby.media">
   <requires>
     <import addon="xbmc.python" version="2.19.0"/>

resources/lib/playutils.py

@@ -66,7 +66,10 @@ class PlayUtils():
     def getPlayUrl(self):
 
         # log filename, used by other addons eg subtitles which require the file name
+        try:
             window('embyfilename', value=self.directPlay())
+        except:
+            log.info("Could not get file path for embyfilename window prop")
 
         playurl = None