diff --git a/DSView/pv/view/dsosignal.cpp b/DSView/pv/view/dsosignal.cpp
index bd8e8114..6af99eff 100755
--- a/DSView/pv/view/dsosignal.cpp
+++ b/DSView/pv/view/dsosignal.cpp
@@ -826,13 +826,12 @@ void DsoSignal::paint_mid(QPainter &p, int left, int right, QColor fore, QColor
     (void)fore;
     (void)back;
 
-    if (!_show || right >= left){
+    if (!_show || right <= left){
         return;
     }
 
     assert(_data);
-    assert(_view);
-    //assert(right >= left);
+    assert(_view); 
 
     if (enabled()) {
         const int index = get_index();