diff --git a/pkg/analyzer/lib/src/dart/analysis/file_state.dart b/pkg/analyzer/lib/src/dart/analysis/file_state.dart
index 6102bf7..b048577 100644
--- a/pkg/analyzer/lib/src/dart/analysis/file_state.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/file_state.dart
@@ -894,7 +894,7 @@
       Source fileSource = resource.createSource();
       Uri uri = _sourceFactory.restoreUri(fileSource);
       Source uriSource = _sourceFactory.forUri2(uri);
-      flag = uriSource.fullName == path;
+      flag = uriSource?.fullName == path;
       _hasUriForPath[path] = flag;
     }
     return flag;