Added check to ensure we are in lighttable view prior to callling darktable.register_lib. If darktable was invoked in single image (darkroom) mode, then an event handler is registered to detect the change from darkroom mode to lighttable mode so that we can then call darktable.register_lib.

official/image_path_in_ui.lua

@@ -33,8 +33,22 @@ local du = require "lib/dtutils"
 
 du.check_min_api_version("2.0.0", "image_path_in_ui") 
 
+local ipiu = {}
+ipiu.module_installed = false
+ipiu.event_registered = false
+
 local main_label = dt.new_widget("label"){selectable = true, ellipsize = "middle", halign = "start"}
 
+local function install_module()
+  if not ipiu.module_installed then
+    dt.register_lib("image_path_no_ui","Selected Images path",true,false,{
+      [dt.gui.views.lighttable] = {"DT_UI_CONTAINER_PANEL_LEFT_CENTER",300}
+      }, main_label
+    )
+    ipiu.module_installed = true
+  end
+end
+
 local function reset_widget()
   local selection = dt.gui.selection()
   local result = ""
@@ -54,10 +68,21 @@ end
 
 main_label.reset_callback = reset_widget
 
-dt.register_lib("image_path_no_ui","Selected Images path",true,false,{
-    [dt.gui.views.lighttable] = {"DT_UI_CONTAINER_PANEL_LEFT_CENTER",300}
-    }, main_label
-  );
+if dt.gui.current_view().name == "lighttable" then
+  install_module()
+else
+  if not ipiu.event_registered then
+    dt.register_event(
+      "view-changed",
+      function(event, old_view, new_view)
+        if new_view.name == "lighttable" and old_view.name == "darkroom" then
+          install_module()
+         end
+      end
+    )
+    ipiu.event_registered = true
+  end
+end
 
 dt.register_event("mouse-over-image-changed",reset_widget);