diff --git a/jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/client/DefaultRheaIterator.java b/jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/client/DefaultRheaIterator.java
index e2b3b4644..e00c857ce 100644
--- a/jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/client/DefaultRheaIterator.java
+++ b/jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/client/DefaultRheaIterator.java
@@ -58,7 +58,8 @@ public DefaultRheaIterator(DefaultRheaKVStore rheaKVStore, byte[] startKey, byte
     @Override
     public synchronized boolean hasNext() {
         if (this.buf.isEmpty()) {
-            while (this.endKey == null || BytesUtil.compare(this.cursorKey, this.endKey) < 0) {
+            while (this.endKey == null || (cursorKey != null //fix issue #990
+                    && BytesUtil.compare(this.cursorKey, this.endKey) < 0)) {
                 final List<KVEntry> kvEntries = this.rheaKVStore.singleRegionScan(this.cursorKey, this.endKey,
                     this.bufSize, this.readOnlySafe, this.returnValue);
                 if (kvEntries.isEmpty()) {