From 842e340b0e5cd06c1f75fef1bce2ed1c12c07414 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ferenc=20G=C3=A9czi?= <ferenc.geczi@ibm.com>
Date: Tue, 19 Mar 2024 12:00:00 +0000
Subject: [PATCH] fix: Only use application_name if @application is set
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Signed-off-by: Ferenc Géczi <ferenc.geczi@ibm.com>
---
 lib/instana/util.rb | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/lib/instana/util.rb b/lib/instana/util.rb
index 721a806e..5ce58ee4 100644
--- a/lib/instana/util.rb
+++ b/lib/instana/util.rb
@@ -86,10 +86,17 @@ def get_app_name
           end
         end
 
-        if defined?(::RailsLts) && ::Rails.respond_to?(:application_name)
-          return ::RailsLts.application_name
-        elsif defined?(::Rails) && ::Rails.respond_to?(:application_name)
-          return ::Rails.application_name
+        rails_module = if defined?(::RailsLts)
+                         then ::RailsLts
+                       elsif defined?(::Rails)
+                         then ::Rails
+                       end
+
+        if rails_module &&
+           rails_module.respond_to?(:application_name) &&
+           rails_module.instance_variables.include?(:@application) &&
+           rails_module.application
+          return rails_module.application_name
         end
 
         if $0.to_s.empty?