diff --git a/OsmAnd-java/src/net/osmand/data/RotatedTileBox.java b/OsmAnd-java/src/net/osmand/data/RotatedTileBox.java
index 707db0b662..178c214ef6 100644
--- a/OsmAnd-java/src/net/osmand/data/RotatedTileBox.java
+++ b/OsmAnd-java/src/net/osmand/data/RotatedTileBox.java
@@ -561,4 +561,16 @@ public class RotatedTileBox {
 		return lat;
 	}
 
+	@Override
+	public String toString() {
+		return "RotatedTileBox [lat=" + lat + ", lon=" + lon + ", rotate="
+				+ rotate + ", density=" + density + ", zoom=" + zoom
+				+ ", mapDensity=" + mapDensity + ", zoomAnimation="
+				+ zoomAnimation + ", zoomFloatPart=" + zoomFloatPart + ", cx="
+				+ cx + ", cy=" + cy + ", pixWidth=" + pixWidth + ", pixHeight="
+				+ pixHeight + "]";
+	}
+
+	
+	
 }
diff --git a/OsmAnd/src/net/osmand/plus/views/controls/RulerControl.java b/OsmAnd/src/net/osmand/plus/views/controls/RulerControl.java
index 43803c4db6..dc4d1d4e92 100644
--- a/OsmAnd/src/net/osmand/plus/views/controls/RulerControl.java
+++ b/OsmAnd/src/net/osmand/plus/views/controls/RulerControl.java
@@ -58,14 +58,14 @@ public class RulerControl extends MapControls {
 			// update cache
 			if (view.isZooming()) {
 				cacheRulerText = null;
-			} else if((tb.getZoom()) != cacheRulerZoom ||
-					Math.abs(tb.getCenterTileX() - cacheRulerTileX) +  Math.abs(tb.getCenterTileY() - cacheRulerTileY) > 1){
+			} else if(((tb.getZoom()) != cacheRulerZoom ||
+					Math.abs(tb.getCenterTileX() - cacheRulerTileX) +  Math.abs(tb.getCenterTileY() - cacheRulerTileY) > 1) && 
+					 tb.getPixWidth() > 0){
 				cacheRulerZoom = (tb.getZoom());
 				cacheRulerTileX = tb.getCenterTileX();
 				cacheRulerTileY = tb.getCenterTileY();
 				final double dist = tb.getDistance(0, tb.getPixHeight() / 2, tb.getPixWidth(), tb.getPixHeight() / 2);
 				double pixDensity = tb.getPixWidth() / dist;
-				
 				double roundedDist = OsmAndFormatter.calculateRoundedDist(dist * screenRulerPercent, view.getApplication());
 				
 				int cacheRulerDistPix = (int) (pixDensity * roundedDist);