diff --git a/src/black/lines.py b/src/black/lines.py
index a73c429e3d9..fb542deae43 100644
--- a/src/black/lines.py
+++ b/src/black/lines.py
@@ -351,9 +351,9 @@ def has_magic_trailing_comma(
 
         if closing.type == token.RSQB:
             if (
-                closing.parent
+                closing.parent is not None
                 and closing.parent.type == syms.trailer
-                and closing.opening_bracket
+                and closing.opening_bracket is not None
                 and is_one_sequence_between(
                     closing.opening_bracket,
                     closing,
@@ -363,22 +363,7 @@ def has_magic_trailing_comma(
             ):
                 return False
 
-            if not ensure_removable:
-                return True
-
-            comma = self.leaves[-1]
-            if comma.parent is None:
-                return False
-            return (
-                comma.parent.type != syms.subscriptlist
-                or closing.opening_bracket is None
-                or not is_one_sequence_between(
-                    closing.opening_bracket,
-                    closing,
-                    self.leaves,
-                    brackets=(token.LSQB, token.RSQB),
-                )
-            )
+            return True
 
         if self.is_import:
             return True