diff --git a/images/tiler-server/config/providers/admin_boundaries_centroids.toml b/images/tiler-server/config/providers/admin_boundaries_centroids.toml
index bd237660..151a4afc 100644
--- a/images/tiler-server/config/providers/admin_boundaries_centroids.toml
+++ b/images/tiler-server/config/providers/admin_boundaries_centroids.toml
@@ -7,7 +7,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry,  
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level,
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -31,7 +31,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level,
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -55,7 +55,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level,
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -79,7 +79,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level,
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -103,7 +103,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level,
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -127,7 +127,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level,
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -151,7 +151,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level,
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
diff --git a/images/tiler-server/config/providers/admin_boundaries_lines.toml b/images/tiler-server/config/providers/admin_boundaries_lines.toml
index bf19e45c..70577032 100644
--- a/images/tiler-server/config/providers/admin_boundaries_lines.toml
+++ b/images/tiler-server/config/providers/admin_boundaries_lines.toml
@@ -7,7 +7,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level, 
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -30,7 +30,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level, 
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -54,7 +54,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level, 
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -77,7 +77,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level, 
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -100,7 +100,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level, 
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -123,7 +123,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level, 
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date, 
@@ -146,7 +146,7 @@ sql = """
 SELECT 
     ST_AsMVTGeom(geometry, !BBOX!) AS geometry, 
     ABS(osm_id) AS osm_id, 
-    NULLIF(admin_level, '') AS admin_level, 
+    admin_level, 
     NULLIF(name, '') AS name, 
     NULLIF(type, '') AS type, 
     NULLIF(start_date, '') AS start_date,