diff --git a/g3w-admin/qdjango/api/projects/serializers.py b/g3w-admin/qdjango/api/projects/serializers.py
index c7efcba94..fbc06e57a 100644
--- a/g3w-admin/qdjango/api/projects/serializers.py
+++ b/g3w-admin/qdjango/api/projects/serializers.py
@@ -823,16 +823,22 @@ def to_representation(self, instance):
 
             # Patch for Proj4 > 4.9.3 version
             if ret["crs"] in settings.G3W_PROJ4_EPSG.keys():
-                proj4 = settings.G3W_PROJ4_EPSG[ret["crs"]]
+                proj4 = settings.G3W_PROJ4_EPSG[ret["crs"]]['proj4']
+                extent = settings.G3W_PROJ4_EPSG[ret["crs"]]['extent']
+
             else:
                 proj4 = crs.toProj4()
+                if crs.postgisSrid() in (4326, 3857):
+                    extent = get_crs_bbox(crs)
+                else:
+                    extent = [0, 0, 8388608, 8388608]
 
             ret['crs'] = {
                 'epsg': crs.postgisSrid(),
                 'proj4': proj4,
                 'geographic': crs.isGeographic(),
                 'axisinverted': crs.hasAxisInverted(),
-                'extent': get_crs_bbox(crs)
+                'extent': extent
             }
 
         # add metadata