diff --git a/demo/video_audiov1_hid_template.c b/demo/video_audiov1_hid_template.c
index 1d1948c9..99df89b9 100644
--- a/demo/video_audiov1_hid_template.c
+++ b/demo/video_audiov1_hid_template.c
@@ -448,6 +448,10 @@ void usbd_video_close(uint8_t busid, uint8_t intf)
 
 void usbd_video_iso_callback(uint8_t busid, uint8_t ep, uint32_t nbytes)
 {
+    if (nbytes == 0) {
+        return;
+    }
+
     if (usbd_video_stream_split_transfer(busid, ep)) {
         /* one frame has done */
         video_iso_tx_busy = false;
diff --git a/demo/video_static_h264_template.c b/demo/video_static_h264_template.c
index a472244b..7337f5f7 100644
--- a/demo/video_static_h264_template.c
+++ b/demo/video_static_h264_template.c
@@ -252,6 +252,10 @@ void usbd_video_close(uint8_t busid, uint8_t intf)
 
 void usbd_video_iso_callback(uint8_t busid, uint8_t ep, uint32_t nbytes)
 {
+    if (nbytes == 0) {
+        return;
+    }
+
     if (usbd_video_stream_split_transfer(busid, ep)) {
         /* one frame has done */
         iso_tx_busy = false;
diff --git a/demo/video_static_mjpeg_template.c b/demo/video_static_mjpeg_template.c
index 667a2fbb..3fc923f8 100644
--- a/demo/video_static_mjpeg_template.c
+++ b/demo/video_static_mjpeg_template.c
@@ -252,6 +252,10 @@ void usbd_video_close(uint8_t busid, uint8_t intf)
 
 void usbd_video_iso_callback(uint8_t busid, uint8_t ep, uint32_t nbytes)
 {
+    if (nbytes == 0) {
+        return;
+    }
+
     if (usbd_video_stream_split_transfer(busid, ep)) {
         /* one frame has done */
         iso_tx_busy = false;
diff --git a/demo/video_static_yuyv_template.c b/demo/video_static_yuyv_template.c
index 6b5da39d..7c7d1789 100644
--- a/demo/video_static_yuyv_template.c
+++ b/demo/video_static_yuyv_template.c
@@ -256,6 +256,10 @@ void usbd_video_close(uint8_t busid, uint8_t intf)
 
 void usbd_video_iso_callback(uint8_t busid, uint8_t ep, uint32_t nbytes)
 {
+    if (nbytes == 0) {
+        return;
+    }
+
     if (usbd_video_stream_split_transfer(busid, ep)) {
         /* one frame has done */
         iso_tx_busy = false;