diff --git a/maps4fs/generator/map.py b/maps4fs/generator/map.py
index 99ac100d..284cceb7 100644
--- a/maps4fs/generator/map.py
+++ b/maps4fs/generator/map.py
@@ -104,6 +104,11 @@ def __init__(  # pylint: disable=R0917, R0915
         self.logger.info("Background settings: %s", background_settings)
         self.grle_settings = grle_settings
         self.logger.info("GRLE settings: %s", grle_settings)
+        if not isinstance(self.grle_settings.base_grass, str):
+            self.grle_settings.base_grass = self.grle_settings.base_grass[0]
+            self.logger.info(
+                "Updated value of the base grass to %s.", self.grle_settings.base_grass
+            )
         self.i3d_settings = i3d_settings
         self.logger.info("I3D settings: %s", i3d_settings)
         self.texture_settings = texture_settings