diff --git a/src/app/cartography/components/d3-map/d3-map.component.ts b/src/app/cartography/components/d3-map/d3-map.component.ts
index 6f2a1746..cdcaad70 100644
--- a/src/app/cartography/components/d3-map/d3-map.component.ts
+++ b/src/app/cartography/components/d3-map/d3-map.component.ts
@@ -206,11 +206,11 @@ export class D3MapComponent implements OnInit, OnChanges, OnDestroy {
   }
 
   updateGrid() {
-    this.nodeGridX = (this.project.scene_width/2 - (Math.floor(this.project.scene_width/2 / this.project.grid_size) * this.project.grid_size));
-    this.nodeGridY = (this.project.scene_height/2 - (Math.floor(this.project.scene_height/2 / this.project.grid_size) * this.project.grid_size));
+    if (this.project.grid_size && this.project.grid_size > 0) this.nodeGridX = (this.project.scene_width/2 - (Math.floor(this.project.scene_width/2 / this.project.grid_size) * this.project.grid_size));
+    if (this.project.grid_size && this.project.grid_size > 0) this.nodeGridY = (this.project.scene_height/2 - (Math.floor(this.project.scene_height/2 / this.project.grid_size) * this.project.grid_size));
 
-    this.drawingGridX = (this.project.scene_width/2 - (Math.floor(this.project.scene_width/2 / this.project.drawing_grid_size) * this.project.drawing_grid_size));
-    this.drawingGridY = (this.project.scene_height/2 - (Math.floor(this.project.scene_height/2 / this.project.drawing_grid_size) * this.project.drawing_grid_size));
+    if (this.project.drawing_grid_size && this.project.drawing_grid_size > 0) this.drawingGridX = (this.project.scene_width/2 - (Math.floor(this.project.scene_width/2 / this.project.drawing_grid_size) * this.project.drawing_grid_size));
+    if (this.project.drawing_grid_size && this.project.drawing_grid_size > 0) this.drawingGridY = (this.project.scene_height/2 - (Math.floor(this.project.scene_height/2 / this.project.drawing_grid_size) * this.project.drawing_grid_size));
   }
 
   @HostListener('window:resize', ['$event'])