Issue 24338. Don't propose creating a local class for prefixed identifiers.

pkg/analysis_server/lib/src/services/correction/fix_internal.dart

Index: pkg/analysis_server/lib/src/services/correction/fix_internal.dart
diff --git a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
index d1ec86effdc3a706d758a350632b987cd2e1381b..eca515bcfb4b25d5a5fc6568dfbc38a0ccddb7a7 100644
--- a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
+++ b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
@@ -452,6 +452,9 @@ class FixProcessor {
       if (parent is PrefixedIdentifier) {
         PrefixedIdentifier prefixedIdentifier = parent;
         prefixElement = prefixedIdentifier.prefix.staticElement;
+        if (prefixElement == null) {
+          return;
+        }
         parent = prefixedIdentifier.parent;
         nameNode = prefixedIdentifier.identifier;
         name = prefixedIdentifier.identifier.name;