diff --git a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/SIPRequestHeaderProvider.java b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/SIPRequestHeaderProvider.java
index d65e6305..ee237c0c 100644
--- a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/SIPRequestHeaderProvider.java
+++ b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/SIPRequestHeaderProvider.java
@@ -225,6 +225,7 @@ public class SIPRequestHeaderProvider {
 	public Request createInfoRequest(Device device, StreamInfo streamInfo, String content, Long cseq)
 			throws PeerUnavailableException, ParseException, InvalidArgumentException {
 		Request request = null;
+		if (streamInfo == null) return null;
 		Dialog dialog = streamSession.getDialog(streamInfo.getDeviceID(), streamInfo.getChannelId());
 
 		SipURI requestLine = sipFactory.createAddressFactory().createSipURI(device.getDeviceId(),
diff --git a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
index cb4cbd74..29f8c058 100644
--- a/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
+++ b/src/main/java/com/genersoft/iot/vmp/gb28181/transmit/cmd/impl/SIPCommander.java
@@ -1589,6 +1589,9 @@ public class SIPCommander implements ISIPCommander {
 			content.append("CSeq: " + cseq + "\r\n");
 			content.append("PauseTime: now\r\n");
 			Request request = headerProvider.createInfoRequest(device, streamInfo, content.toString(), cseq);
+			if (request == null) {
+				return;
+			}
 			logger.info(request.toString());
 			ClientTransaction clientTransaction = null;
 			if ("TCP".equals(device.getTransport())) {
@@ -1617,6 +1620,7 @@ public class SIPCommander implements ISIPCommander {
 			content.append("CSeq: " + cseq + "\r\n");
 			content.append("Range: npt=now-\r\n");
 			Request request = headerProvider.createInfoRequest(device, streamInfo, content.toString(), cseq);
+			if (request == null) return;
 			logger.info(request.toString());
 			ClientTransaction clientTransaction = null;
 			if ("TCP".equals(device.getTransport())) {
@@ -1645,6 +1649,7 @@ public class SIPCommander implements ISIPCommander {
 			content.append("Range: npt=" + Math.abs(seekTime) + "-\r\n");
 
 			Request request = headerProvider.createInfoRequest(device, streamInfo, content.toString(), cseq);
+			if (request == null) return;
 			logger.info(request.toString());
 			ClientTransaction clientTransaction = null;
 			if ("TCP".equals(device.getTransport())) {
@@ -1672,6 +1677,7 @@ public class SIPCommander implements ISIPCommander {
 			content.append("CSeq: " + cseq + "\r\n");
 			content.append("Scale: " + String.format("%.1f",speed) + "\r\n");
 			Request request = headerProvider.createInfoRequest(device, streamInfo, content.toString(), cseq);
+			if (request == null) return;
 			logger.info(request.toString());
 			ClientTransaction clientTransaction = null;
 			if ("TCP".equals(device.getTransport())) {