diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad7db91a..fb1b0969 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - AUR:
     - Installed files available in the Info window
     - Improving Arch distro checking
+- Flatpak:
+    - error when retrieving information ( Ubuntu 18.04 )
 
 ### Fixes
 - Update-check daemon not showing notifications
diff --git a/bauh/gems/flatpak/controller.py b/bauh/gems/flatpak/controller.py
index 018b898f..ad9dc692 100644
--- a/bauh/gems/flatpak/controller.py
+++ b/bauh/gems/flatpak/controller.py
@@ -139,7 +139,10 @@ class FlatpakManager(SoftwareManager):
         app_info['name'] = app.name
         app_info['type'] = 'runtime' if app.runtime else 'app'
         app_info['description'] = strip_html(app.description) if app.description else ''
-        app_info['installed'] = app_info['installed'].replace('?', ' ')
+
+        if app_info.get('installed'):
+            app_info['installed'] = app_info['installed'].replace('?', ' ')
+
         return app_info
 
     def get_history(self, pkg: FlatpakApplication) -> PackageHistory: