diff --git a/pkg/analyzer/lib/src/dart/element/element.dart b/pkg/analyzer/lib/src/dart/element/element.dart
index 968718a..51d515f 100644
--- a/pkg/analyzer/lib/src/dart/element/element.dart
+++ b/pkg/analyzer/lib/src/dart/element/element.dart
@@ -5574,12 +5574,16 @@
       if (linkedNode is GenericTypeAlias) {
         var context = enclosingUnit.linkedContext;
         var function = context.getGeneticTypeAliasFunction(linkedNode);
-        var reference = context.getGenericFunctionTypeReference(function);
-        return _function = GenericFunctionTypeElementImpl.forLinkedNode(
-          this,
-          reference,
-          function,
-        );
+        if (function != null) {
+          var reference = context.getGenericFunctionTypeReference(function);
+          return _function = GenericFunctionTypeElementImpl.forLinkedNode(
+            this,
+            reference,
+            function,
+          );
+        } else {
+          return null;
+        }
       } else {
         return _function = GenericFunctionTypeElementImpl.forLinkedNode(
           this,
diff --git a/pkg/analyzer/lib/src/summary2/ast_binary_writer.dart b/pkg/analyzer/lib/src/summary2/ast_binary_writer.dart
index 028ffd8..2cc58d4 100644
--- a/pkg/analyzer/lib/src/summary2/ast_binary_writer.dart
+++ b/pkg/analyzer/lib/src/summary2/ast_binary_writer.dart
@@ -667,7 +667,7 @@
   LinkedNodeBuilder visitGenericTypeAlias(GenericTypeAlias node) {
     var builder = LinkedNodeBuilder.genericTypeAlias(
       genericTypeAlias_equals: _getToken(node.equals),
-      genericTypeAlias_functionType: node.functionType.accept(this),
+      genericTypeAlias_functionType: node.functionType?.accept(this),
       genericTypeAlias_typeParameters: node.typeParameters?.accept(this),
       typeAlias_hasSelfReference:
           LazyGenericTypeAlias.getHasSelfReference(node),
diff --git a/pkg/analyzer/lib/src/summary2/metadata_resolver.dart b/pkg/analyzer/lib/src/summary2/metadata_resolver.dart
index 562af3dd..4705ec8 100644
--- a/pkg/analyzer/lib/src/summary2/metadata_resolver.dart
+++ b/pkg/analyzer/lib/src/summary2/metadata_resolver.dart
@@ -125,7 +125,7 @@
   void visitGenericTypeAlias(GenericTypeAlias node) {
     node.metadata.accept(this);
     node.typeParameters?.accept(this);
-    node.functionType.accept(this);
+    node.functionType?.accept(this);
   }
 
   @override
diff --git a/pkg/analyzer/lib/src/summary2/reference_resolver.dart b/pkg/analyzer/lib/src/summary2/reference_resolver.dart
index 4b6dae9..74b8547 100644
--- a/pkg/analyzer/lib/src/summary2/reference_resolver.dart
+++ b/pkg/analyzer/lib/src/summary2/reference_resolver.dart
@@ -789,7 +789,7 @@
     scope = TypeParameterScope(outerScope, element);
 
     node.typeParameters?.accept(this);
-    node.functionType.accept(this);
+    node.functionType?.accept(this);
     nodesToBuildType.addDeclaration(node);
 
     scope = outerScope;
diff --git a/pkg/analyzer/lib/src/summary2/simply_bounded.dart b/pkg/analyzer/lib/src/summary2/simply_bounded.dart
index cac5831..e1bbe8a 100644
--- a/pkg/analyzer/lib/src/summary2/simply_bounded.dart
+++ b/pkg/analyzer/lib/src/summary2/simply_bounded.dart
@@ -132,10 +132,15 @@
       collector.visitParameters(node.parameters);
       return collector.types;
     } else if (node is GenericTypeAlias) {
-      var collector = _TypeCollector();
-      collector.addType(node.functionType.returnType);
-      collector.visitParameters(node.functionType.parameters);
-      return collector.types;
+      var functionType = node.functionType;
+      if (functionType != null) {
+        var collector = _TypeCollector();
+        collector.addType(functionType.returnType);
+        collector.visitParameters(functionType.parameters);
+        return collector.types;
+      } else {
+        return const <TypeAnnotation>[];
+      }
     } else {
       throw StateError('(${node.runtimeType}) $node');
     }
diff --git a/pkg/analyzer/lib/src/summary2/type_alias.dart b/pkg/analyzer/lib/src/summary2/type_alias.dart
index 77b6876..56ed006 100644
--- a/pkg/analyzer/lib/src/summary2/type_alias.dart
+++ b/pkg/analyzer/lib/src/summary2/type_alias.dart
@@ -47,10 +47,12 @@
   }
 
   void genericTypeAlias(GenericTypeAlias node) {
-    var function = node.functionType;
-    _typeParameterList(function.typeParameters);
-    _formalParameterList(function.parameters);
-    _visit(function.returnType);
+    var functionType = node.functionType;
+    if (functionType != null) {
+      _typeParameterList(functionType.typeParameters);
+      _formalParameterList(functionType.parameters);
+      _visit(functionType.returnType);
+    }
   }
 
   void _argumentList(TypeArgumentList node) {