diff --git a/code/utils_misc.js b/code/utils_misc.js
index df66a507..95329149 100644
--- a/code/utils_misc.js
+++ b/code/utils_misc.js
@@ -229,7 +229,7 @@ window.renderLimitReached = function(ratio) {
 window.getMinPortalLevel = function() {
   var z = map.getZoom();
   if(z >= 17) return 0;
-  var conv = ['impossible', 8,8,8,7,7,6,6,5,4,4,3,3,2,2,1,1];
+  var conv = [8,8,8,8,7,7,6,6,5,4,4,3,3,2,2,1,1];
   var minLevelByRenderLimit = portalRenderLimit.getMinLevel();
   var result = minLevelByRenderLimit > conv[z]
     ? minLevelByRenderLimit