diff --git a/lib/local_comms.js b/lib/local_comms.js
index ac70fea..17c9975 100644
--- a/lib/local_comms.js
+++ b/lib/local_comms.js
@@ -628,7 +628,7 @@ function Database(){
                 let blockList = [];
                 console.log("Scanning from: "+lastBlock + " for more than: " + difficulty + " shares");
                 range.range(0, lastBlock+1).forEach(function (blockID) {
-                    blockID = (blockID - lastBlock+1) * -1;
+                    blockID = Number((blockID - lastBlock+1) * -1);
                     if (blockID < 0){
                         return;
                     }