diff --git a/src/normcap/app.py b/src/normcap/app.py
index 772cc904..4fb999d4 100644
--- a/src/normcap/app.py
+++ b/src/normcap/app.py
@@ -15,6 +15,7 @@
 from normcap.utils import (
     create_argparser,
     init_logger,
+    set_environ_for_flatpak,
     set_environ_for_prebuild_package,
     set_environ_for_wayland,
 )
@@ -44,6 +45,8 @@ def main():
         set_environ_for_prebuild_package()
     if system_info.display_manager_is_wayland():
         set_environ_for_wayland()
+    if system_info.is_flatpak_package():
+        set_environ_for_flatpak()
     if system_info.is_prebuild_package() or system_info.is_flatpak_package():
         utils.copy_tessdata_files_to_config_dir()
 
diff --git a/src/normcap/utils.py b/src/normcap/utils.py
index 5c3fbd8e..19c44d1d 100644
--- a/src/normcap/utils.py
+++ b/src/normcap/utils.py
@@ -58,6 +58,20 @@ def set_environ_for_wayland():
         os.environ["QT_QPA_PLATFORM"] = "wayland"
 
 
+def set_environ_for_flatpak():
+    # Unity DE (and maybe others) use gtk-nocsd to remove client side decorations.
+    # It doesn't work within FlatPak, and the error message make pytesseract crash.
+    # Therefore we deactivate it within the Flatpak.
+    # See: https://github.com/dynobo/normcap/issues/290#issuecomment-1289629427
+    ld_preload = os.environ.get("LD_PRELOAD", "")
+    if "nocsd" in ld_preload.lower():
+        logger.warning(
+            "Found LD_PRELOAD='%s'. Setting to LD_PRELOAD='' to avoid issues.",
+            ld_preload,
+        )
+        os.environ["LD_PRELOAD"] = ""
+
+
 # Some overrides when running in prebuild package
 def set_environ_for_prebuild_package():