diff --git a/scripts/serverPmTileExtracts.ts b/scripts/serverPmTileExtracts.ts
index cf7349069..e63ac2cce 100644
--- a/scripts/serverPmTileExtracts.ts
+++ b/scripts/serverPmTileExtracts.ts
@@ -37,8 +37,7 @@ class ServerPmTileExtracts extends Script {
                                    body: string,
                                    res: ServerResponse) => {
                         const [z,x,y] = path.split(".")[0].split("/").map(x => Number(x))
-                        const maxzoom = zoomlevels[z]
-                        if(!maxzoom){
+                        if(z in zoomlevels){
                             throw "Invalid zoomlevel, must be one of "+Array.from(Object.keys(zoomlevels)).join(", ")
                         }