diff --git a/MarkdownLivePreview.py b/MarkdownLivePreview.py
index da25006..704aaf3 100644
--- a/MarkdownLivePreview.py
+++ b/MarkdownLivePreview.py
@@ -117,7 +117,7 @@ class OpenMarkdownPreviewCommand(sublime_plugin.TextCommand):
 
         markdown_view.set_syntax_file(syntax_file)
         markdown_view.settings().set(
-            MARKDOWN_VIEW_INFOS, {"original_window_id": original_window_id,},
+            MARKDOWN_VIEW_INFOS, {"original_window_id": original_window_id, "preview_view_id": preview_view.id(),},
         )
 
     def is_enabled(self):
@@ -162,7 +162,13 @@ class MarkdownLivePreviewListener(sublime_plugin.EventListener):
         if not infos:
             return
 
-        preview_view = markdown_view.window().active_view_in_group(1)
+        preview_view_id = infos.get("preview_view_id")
+        if not preview_view_id:
+            return # Should not happen if setup was correct
+
+        preview_view = sublime.View(preview_view_id)
+        if not preview_view.is_valid():
+            return # Preview view was closed before loading finished
 
         self.phantom_sets[markdown_view.id()] = sublime.PhantomSet(preview_view)
         self._update_preview(markdown_view)
@@ -177,7 +183,7 @@ class MarkdownLivePreviewListener(sublime_plugin.EventListener):
         if markdown_view.id() in self.phantom_sets:
             del self.phantom_sets[markdown_view.id()]
 
-        # don’t close the entire window—just let the user close the preview tab:
+        # don't close the entire window—just let the user close the preview tab:
         # self.preview_window.run_command("close_window")
 
         # find the window with the right id
@@ -243,7 +249,18 @@ class MarkdownLivePreviewListener(sublime_plugin.EventListener):
         total_region = sublime.Region(0, markdown_view.size())
         markdown = markdown_view.substr(total_region)
 
-        preview_view = markdown_view.window().active_view_in_group(1)
+        infos = markdown_view.settings().get(MARKDOWN_VIEW_INFOS)
+        if not infos:
+            return # Should not happen
+
+        preview_view_id = infos.get("preview_view_id")
+        if not preview_view_id:
+            return # Should not happen
+
+        preview_view = sublime.View(preview_view_id)
+        if not preview_view.is_valid():
+            return # Preview view was closed
+
         # Get viewport_width, default to a large value if view isn't ready
         viewport_extent = preview_view.viewport_extent()
         viewport_width = viewport_extent[0] if viewport_extent else 1024