diff --git a/DSView/pv/sigsession.h b/DSView/pv/sigsession.h
index f768adfe..049eb794 100644
--- a/DSView/pv/sigsession.h
+++ b/DSView/pv/sigsession.h
@@ -403,6 +403,10 @@ public:
     view::DecodeTrace* get_decoder_trace(int index);
     view::Signal* get_signal_by_index(int index);
 
+    inline bool have_view_data(){
+        return get_signal_snapshot()->have_data();
+    }
+
 private:
     void set_cur_samplelimits(uint64_t samplelimits);
     void set_cur_snap_samplerate(uint64_t samplerate);
diff --git a/DSView/pv/view/viewport.cpp b/DSView/pv/view/viewport.cpp
index 832de79a..0c4cf479 100644
--- a/DSView/pv/view/viewport.cpp
+++ b/DSView/pv/view/viewport.cpp
@@ -1686,7 +1686,7 @@ void Viewport::paintMeasure(QPainter &p, QColor fore, QColor back)
         measure_updated();
     }
 
-    if (_action_type == LOGIC_EDGE) {
+    if (_action_type == LOGIC_EDGE && _view.session().have_view_data()) {
         p.setPen(active_color);
         p.drawLine(QLineF(_cur_preX, _cur_midY-5, _cur_preX, _cur_midY+5));
         p.drawLine(QLineF(_cur_aftX, _cur_midY-5, _cur_aftX, _cur_midY+5));