Moar nanoUI runtime fixes

code/modules/nano/nanoexternal.dm

@@ -1,5 +1,5 @@
- // This file contains all Nano procs/definitions for external classes/objects 
- 
+ // This file contains all Nano procs/definitions for external classes/objects
+
  /**
   * Called when a Nano UI window is closed
   * This is how Nano handles closed windows
@@ -13,9 +13,9 @@
 
 	var/datum/nanoui/ui = locate(uiref)
 
-	if (ui)
+	if (istype(ui))
 		ui.close()
-		
+
 		if(ui.ref)
 			var/href = "close=1"
 			src.Topic(href, params2list(href), ui.ref)	// this will direct to the atom's Topic() proc via client.Topic()
@@ -31,13 +31,13 @@
   * ui_interact is currently defined for /atom/movable
   *
   * @param user /mob The mob who is interacting with this ui
-  * @param ui_key string A string key to use for this ui. Allows for multiple unique uis on one obj/mob (defaut value "main")  
+  * @param ui_key string A string key to use for this ui. Allows for multiple unique uis on one obj/mob (defaut value "main")
   * @param ui /datum/nanoui This parameter is passed by the nanoui process() proc when updating an open ui
   *
   * @return nothing
   */
 /atom/movable/proc/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null)
 	return
-	
+
 // Used by the Nano UI Manager (/datum/nanomanager) to track UIs opened by this mob
 /mob/var/list/open_uis = list()

code/modules/nano/nanoui.dm

@@ -413,7 +413,7 @@ nanoui is used to open and update nano browser uis
 	if (status != STATUS_INTERACTIVE || user != usr) // If UI is not interactive or usr calling Topic is not the UI user
 		return
 
-	if (src_object.Topic(href, href_list))
+	if (src_object && src_object.Topic(href, href_list))
 		nanomanager.update_uis(src_object) // update all UIs attached to src_object
 
  /**