3 files changed, 17 insertions, 4 deletions
diff --git a/proc.c b/proc.c
index d11d167f70..0c8889f04b 100644
--- a/proc.c
+++ b/proc.c
@@ -3045,7 +3045,7 @@ method_super_method(VALUE method)
     TypedData_Get_Struct(method, struct METHOD, &method_data_type, data);
     iclass = data->iclass;
     if (!iclass) return Qnil;
-    if (data->me->def->type == VM_METHOD_TYPE_ALIAS) {
+    if (data->me->def->type == VM_METHOD_TYPE_ALIAS && data->me->defined_class) {
         super_class = RCLASS_SUPER(rb_find_defined_class_by_owner(data->me->defined_class,
             data->me->def->body.alias.original_me->owner));
         mid = data->me->def->body.alias.original_me->def->original_id;
diff --git a/test/ruby/test_method.rb b/test/ruby/test_method.rb
index 0f0807af9d..03a6c560e6 100644
--- a/test/ruby/test_method.rb
+++ b/test/ruby/test_method.rb
@@ -1144,6 +1144,19 @@ class TestMethod < Test::Unit::TestCase
     assert_nil(m.super_method)
   end
 
+  # Bug 17780
+  def test_super_method_module_alias
+    m = Module.new do
+      def foo
+      end
+      alias :f :foo
+    end
+
+    method = m.instance_method(:f)
+    super_method = method.super_method
+    assert_nil(super_method)
+  end
+
   def rest_parameter(*rest)
     rest
   end
diff --git a/version.h b/version.h
index fd537b7a30..66b31aad95 100644
--- a/version.h
+++ b/version.h
@@ -2,11 +2,11 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 4
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 185
+#define RUBY_PATCHLEVEL 186
 
 #define RUBY_RELEASE_YEAR 2021
-#define RUBY_RELEASE_MONTH 4
-#define RUBY_RELEASE_DAY 16
+#define RUBY_RELEASE_MONTH 5
+#define RUBY_RELEASE_DAY 31
 
 #include "ruby/version.h"