diff --git a/plugins/org.jkiss.dbeaver.ui.dashboard/src/org/jkiss/dbeaver/ui/dashboard/control/DashboardItem.java b/plugins/org.jkiss.dbeaver.ui.dashboard/src/org/jkiss/dbeaver/ui/dashboard/control/DashboardItem.java
index d2ac645f6f14fd1d5e951d5ed2af844daab35615..b9da800537dc11c0decf8cc5c5262baf918f11d8 100644
--- a/plugins/org.jkiss.dbeaver.ui.dashboard/src/org/jkiss/dbeaver/ui/dashboard/control/DashboardItem.java
+++ b/plugins/org.jkiss.dbeaver.ui.dashboard/src/org/jkiss/dbeaver/ui/dashboard/control/DashboardItem.java
@@ -218,7 +218,9 @@ public class DashboardItem extends Composite implements DashboardContainer {
     @Override
     public void updateDashboardData(DashboardDataset dataset) {
         UIUtils.asyncExec(() -> {
-            renderer.updateDashboardData(this, lastUpdateTime, dataset);
+            if (renderer != null) {
+                renderer.updateDashboardData(this, lastUpdateTime, dataset);
+            }
         });
         lastUpdateTime = new Date();
     }
diff --git a/plugins/org.jkiss.dbeaver.ui.dashboard/src/org/jkiss/dbeaver/ui/dashboard/histogram/DashboardRendererHistogram.java b/plugins/org.jkiss.dbeaver.ui.dashboard/src/org/jkiss/dbeaver/ui/dashboard/histogram/DashboardRendererHistogram.java
index d86bdde75d5a5e52915da8565ead9101382d350e..ff3c2d4b2031fec31d995992746b2018bcf2df46 100644
--- a/plugins/org.jkiss.dbeaver.ui.dashboard/src/org/jkiss/dbeaver/ui/dashboard/histogram/DashboardRendererHistogram.java
+++ b/plugins/org.jkiss.dbeaver.ui.dashboard/src/org/jkiss/dbeaver/ui/dashboard/histogram/DashboardRendererHistogram.java
@@ -116,7 +116,10 @@ public class DashboardRendererHistogram implements DashboardRenderer {
 
 
         // Set background
-        plot.setBackgroundPaint(AWTUtils.makeAWTColor(composite.getBackground()));
+        plot.setBackgroundPaint(histogramChart.getBackgroundPaint());
+        Color gridColor = AWTUtils.makeAWTColor(UIStyles.getDefaultTextForeground());
+        plot.setDomainGridlinePaint(gridColor);
+        plot.setRangeGridlinePaint(gridColor);
 
         DashboardChartComposite chartComposite = new DashboardChartComposite(container, composite, SWT.NONE, preferredSize);
         chartComposite.setChart(histogramChart);