diff --git a/AUTHORS.txt b/AUTHORS.txt
index 717e9d91fd..79213908b5 100644
--- a/AUTHORS.txt
+++ b/AUTHORS.txt
@@ -10,6 +10,7 @@
 * `Aru Sahni <https://github.com/arusahni>`_
 * `Arun Persaud <https://github.com/arunpersaud>`_
 * `Aurelien Naldi <https://github.com/aurelien-naldi>`_
+* `Ayudh Haldar <https://github.com/Ayudh-M>`_
 * `Ben Mather <https://github.com/bwhmather>`_
 * `Bendik Knapstad <https://github.com/knapstad>`_
 * `Boris Kaul <https://github.com/localvoid>`_
diff --git a/CHANGES.txt b/CHANGES.txt
index f5a468f339..6d28998c96 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -39,6 +39,7 @@ Features
 Bugfixes
 --------
 
+* Ignore “`sizes` ⇒ false” in WordPress attachment metadata to prevent a crash in ``import_wordpress`` (Issue #3810)
 * Ignore errors in parsing SVG files for shrinking them, copy original file to output instead
   (Issue #3785)
 * Restore ``annotation_helper.tmpl`` with dummy content - fix themes still mentioning it
@@ -47,6 +48,7 @@ Bugfixes
 * ``nikola serve`` now works with non-root SITE_URL.
 * Stack traces meaningless for end users now more reliably suppressed (Issue #3838).
 
+
 Other
 -----
 
diff --git a/nikola/plugins/command/import_wordpress.py b/nikola/plugins/command/import_wordpress.py
index 9a8b130bd3..685163fb1a 100644
--- a/nikola/plugins/command/import_wordpress.py
+++ b/nikola/plugins/command/import_wordpress.py
@@ -626,21 +626,47 @@ def add(our_key, wp_key, is_int=False, ignore_zero=False, is_float=False):
                         if len(dst_meta) > 0:
                             files_meta[0]['meta'] = dst_meta
 
+                    # ------------------------------------------------------------------
+                    # Previous implementation kept only for reference:
                     # Find other sizes of image
-                    if size_key not in metadata:
-                        continue
+                    # if size_key not in metadata:
+                    #     continue
 
-                    for size in metadata[size_key]:
-                        filename = metadata[size_key][size][file_key]
-                        url = '/'.join([source_path, filename.decode('utf-8')])
+                    # for size in metadata[size_key]:
+                    #     filename = metadata[size_key][size][file_key]
+                    #     url = '/'.join([source_path, filename.decode('utf-8')])
 
-                        # Construct metadata
-                        meta = {}
-                        meta['size'] = size.decode('utf-8')
-                        if width_key in metadata[size_key][size] and height_key in metadata[size_key][size]:
-                            meta['width'] = int(metadata[size_key][size][width_key])
-                            meta['height'] = int(metadata[size_key][size][height_key])
+                    #     # Construct metadata
+                    #     meta = {}
+                    #     meta['size'] = size.decode('utf-8')
+                    #     if width_key in metadata[size_key][size] and height_key in metadata[size_key][size]:
+                    #         meta['width'] = int(metadata[size_key][size][width_key])
+                    #         meta['height'] = int(metadata[size_key][size][height_key])
+                    # ------------------------------------------------------------------
+
+                    # Find other sizes of image — *robust to `"sizes" => false`*
+                    sizes_dict = metadata.get(size_key)
+
+                    # WP ≥ 6 writes `"sizes" => false` when no thumbnails exist.
+                    # That becomes Python `False`, which is not iterable/subscriptable
+                    # and caused  TypeError: 'bool' object is not subscriptable  (#3810).
+                    if not isinstance(sizes_dict, dict):
+                        continue              # nothing more to import for this element
 
+                    for size, size_info in sizes_dict.items():
+                        if not isinstance(size_info, dict) or file_key not in size_info:
+                            continue          # skip malformed entries
+
+                        filename = size_info[file_key]
+                        url = "/".join([source_path, filename.decode("utf-8")])
+
+                        # Construct metadata
+                        meta = {"size": size.decode("utf-8")}
+                        if width_key in size_info and height_key in size_info:
+                            meta["width"] = int(size_info[width_key])
+                            meta["height"] = int(size_info[height_key])
+                    # ------------------------------------------------------------------
+                    
                         path = urlparse(url).path
                         dst_path = os.path.join(*([self.output_folder, 'files'] + list(path.split('/'))))
                         if self.no_downloads: