--- alexandria-book-collection-manager-0.7.4/lib/alexandria/ui/new_book_dialog.rb.nothread	2020-01-03 17:37:42.394366241 +0900
+++ alexandria-book-collection-manager-0.7.4/lib/alexandria/ui/new_book_dialog.rb	2020-01-04 13:24:08.240415691 +0900
@@ -279,15 +279,17 @@ module Alexandria
                          get_images_async
                          false # continue == false if you get to here. Stop timeout.
                        end
-                     else
+                     elsif @find_thread
                        # Stop if the book find thread has stopped.
                        @find_thread.alive?
+                     else
+                       true
                      end
           # continue == false if @find_error OR if results are returned
           # timeout ends if continue is false!
 
           unless continue
-            unless @find_thread.alive? # This happens after find_thread is done
+            unless (@find_thread && @find_thread.alive?) # This happens after find_thread is done
               unless @destroyed
                 # GLib::Source.remove(progress_pulsing)
                 # @progressbar.hide