diff --git a/plugins/ai_shoe_det/ai_shoe_det_node.cpp b/plugins/ai_shoe_det/ai_shoe_det_node.cpp
index 366501c..f432db9 100644
--- a/plugins/ai_shoe_det/ai_shoe_det_node.cpp
+++ b/plugins/ai_shoe_det/ai_shoe_det_node.cpp
@@ -158,7 +158,8 @@ public:
 #if defined(RK3588_ENABLE_RKNN)
         if (infer_interval_ms_ > 0 && frame->pts > 0) {
             const int64_t pts_ms = static_cast<int64_t>(frame->pts / 1000ULL);
-            if (last_infer_pts_ms_ > 0 && (pts_ms - last_infer_pts_ms_) < infer_interval_ms_) {
+            const int64_t delta_ms = pts_ms - last_infer_pts_ms_;
+            if (last_infer_pts_ms_ > 0 && delta_ms > 0 && delta_ms < infer_interval_ms_) {
                 Push(frame);
                 return NodeStatus::OK;
             }
diff --git a/plugins/ai_yolo/ai_yolo_node.cpp b/plugins/ai_yolo/ai_yolo_node.cpp
index b5519f0..3a14458 100644
--- a/plugins/ai_yolo/ai_yolo_node.cpp
+++ b/plugins/ai_yolo/ai_yolo_node.cpp
@@ -752,7 +752,8 @@ public:
 
         if (infer_interval_ms_ > 0 && frame->pts > 0) {
             const int64_t pts_ms = static_cast<int64_t>(frame->pts / 1000ULL);
-            if (last_infer_pts_ms_ > 0 && (pts_ms - last_infer_pts_ms_) < infer_interval_ms_) {
+            const int64_t delta_ms = pts_ms - last_infer_pts_ms_;
+            if (last_infer_pts_ms_ > 0 && delta_ms > 0 && delta_ms < infer_interval_ms_) {
                 PushToDownstream(frame);
                 ++processed_;
                 return NodeStatus::OK;