diff --git a/astroid/interpreter/_import/spec.py b/astroid/interpreter/_import/spec.py
index 469508d..59546a0 100644
--- a/astroid/interpreter/_import/spec.py
+++ b/astroid/interpreter/_import/spec.py
@@ -341,7 +341,7 @@
 
 def _get_zipimporters() -> Iterator[tuple[str, zipimport.zipimporter]]:
     for filepath, importer in sys.path_importer_cache.items():
-        if isinstance(importer, zipimport.zipimporter):
+        if importer is not None and isinstance(importer, zipimport.zipimporter):
             yield filepath, importer