diff --git a/src/Charts/LTMWindow.cpp b/src/Charts/LTMWindow.cpp
index aabd6089b..47bd92579 100644
--- a/src/Charts/LTMWindow.cpp
+++ b/src/Charts/LTMWindow.cpp
@@ -1160,14 +1160,17 @@ LTMWindow::dataTable(bool html)
 
     // align the starting X values of all columns using the
     // lowest xValue and highest xValue as borders
-    if (lowestFirstXvalue != highestFirstXvalue) {
+    // for columns which have data at all - and if there is something to adjust
+    if (!firstXvalue && lowestFirstXvalue != highestFirstXvalue) {
         for (int i = 0; i< columns.count(); i++) {
-            double xValue = columns[i].x[0];
-            while (columns[i].x[0] > lowestFirstXvalue) {
-                xValue--;
-                columns[i].x.prepend(xValue);
-                columns[i].y.prepend(0.0);
-                columns[i].n++;
+            if (columns[i].n > 0) {
+                double xValue = columns[i].x[0];
+                while (columns[i].x[0] > lowestFirstXvalue) {
+                    xValue--;
+                    columns[i].x.prepend(xValue);
+                    columns[i].y.prepend(0.0);
+                    columns[i].n++;
+                }
             }
         }
         // adjust number of visible rows in table