diff --git a/src/main/java/org/bdware/server/http/DOIPOverHttpHandler.java b/src/main/java/org/bdware/server/http/DOIPOverHttpHandler.java
index d1ffa4e..d3396cc 100644
--- a/src/main/java/org/bdware/server/http/DOIPOverHttpHandler.java
+++ b/src/main/java/org/bdware/server/http/DOIPOverHttpHandler.java
@@ -30,6 +30,7 @@ public class DOIPOverHttpHandler {
     private static final Logger LOGGER = LogManager.getLogger(DOIPOverHttpHandler.class);
     Map<String, ZipFile> zipFilePool = new HashMap<>();
     Map<String, Long> lastVisit = new HashMap<>();
+    Map<String, Long> lastModified = new HashMap<>();
 
     public synchronized void pruneZipPool() {
         Set<String> toPrune = new HashSet<>();
@@ -45,6 +46,7 @@ public class DOIPOverHttpHandler {
                 ZipFile zf = zipFilePool.get(str);
                 zipFilePool.remove(str);
                 lastVisit.remove(str);
+                lastModified.remove(str);
                 zf.close();
             } catch (Exception e) {
 
@@ -162,7 +164,6 @@ public class DOIPOverHttpHandler {
     }
 
     private void sendAssets(JsonObject arg, ChannelHandlerContext ctx) throws Exception {
-
         ContractMeta meta =
                 CMActions.manager.statusRecorder.getContractMeta(
                         arg.get("contractID").getAsString());
@@ -199,10 +200,22 @@ public class DOIPOverHttpHandler {
         try {
             ZipFile cachedFile = zipFilePool.get(scriptStr);
             if (cachedFile == null) {
+                File f = new File(scriptStr);
                 cachedFile =
-                        new ZipFile(new File(scriptStr));
+                        new ZipFile(f);
                 zipFilePool.put(scriptStr, cachedFile);
+                lastModified.put(scriptStr, f.lastModified());
+            } else {
+                File f = new File(scriptStr);
+                if (lastModified.get(scriptStr) != f.lastModified()) {
+                    cachedFile.close();
+                    cachedFile =
+                            new ZipFile(f);
+                    zipFilePool.put(scriptStr, cachedFile);
+                    lastModified.put(scriptStr, f.lastModified());
+                }
             }
+
             lastVisit.put(scriptStr, System.currentTimeMillis());
             return cachedFile;
         } catch (Exception e) {
diff --git a/src/main/java/org/bdware/server/nodecenter/client/NodeCenterClientController.java b/src/main/java/org/bdware/server/nodecenter/client/NodeCenterClientController.java
index 897ef57..3c64a38 100644
--- a/src/main/java/org/bdware/server/nodecenter/client/NodeCenterClientController.java
+++ b/src/main/java/org/bdware/server/nodecenter/client/NodeCenterClientController.java
@@ -681,7 +681,11 @@ public class NodeCenterClientController implements NodeCenterConn {
 
     @Action(async = true)
     public void onDistributeYPK(JsonObject json, ResultCallback rc) {
-        onDistribute(json, rc);
+        try {
+            onDistribute(json, rc);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
     }
 
     @Action(async = true)