diff --git a/front/src/Phaser/Game/GameScene.ts b/front/src/Phaser/Game/GameScene.ts
index d6df242f..6427e0c0 100644
--- a/front/src/Phaser/Game/GameScene.ts
+++ b/front/src/Phaser/Game/GameScene.ts
@@ -1077,14 +1077,24 @@ ${escapedMessage}
             console.warn('Could not find layer "' + layerName + '" when calling setProperty');
             return;
         }
+        if (propertyName === "exitUrl" && typeof propertyValue === "string") {
+            this.loadNextGame(propertyValue);
+        }
         if (layer.properties === undefined) {
             layer.properties = [];
         }
         const property = layer.properties.find((property) => property.name === propertyName);
         if (property === undefined) {
+            if (propertyValue === undefined) {
+                return;
+            }
             layer.properties.push({ name: propertyName, type: typeof propertyValue, value: propertyValue });
             return;
         }
+        if (propertyValue === undefined) {
+            const index = layer.properties.indexOf(property);
+            layer.properties.splice(index, 1);
+        }
         property.value = propertyValue;
     }