added checks to prevent box2d crashing

src/box2dLight/ChainLight.java

@@ -448,7 +448,7 @@ protected void updateMesh() {
 			my[i] = tmpEnd.y;
 			tmpStart.x = startX[i];
 			tmpStart.y = startY[i];
-			if (rayHandler.world != null && !xray) {
+			if (rayHandler.world != null && !xray && !tmpStart.equals(tmpEnd)) {
 				rayHandler.world.rayCast(ray, tmpStart, tmpEnd);
 			}
 		}

src/box2dLight/DirectionalLight.java

@@ -117,7 +117,7 @@ void update () {
 			mx[i] = end[i].x = steppedX + xAxelOffSet;
 			my[i] = end[i].y = steppedY + yAxelOffSet;
 
-			if (rayHandler.world != null && !xray) {
+			if (rayHandler.world != null && !xray && !start[i].equals(end[i])) {
 				rayHandler.world.rayCast(ray, start[i], end[i]);
 			}
 		}

src/box2dLight/PositionalLight.java

@@ -238,7 +238,7 @@ protected void updateMesh() {
 			mx[i] = tmpEnd.x;
 			tmpEnd.y = endY[i] + start.y;
 			my[i] = tmpEnd.y;
-			if (rayHandler.world != null && !xray) {
+			if (rayHandler.world != null && !xray && !start.equals(tmpEnd)) {
 				rayHandler.world.rayCast(ray, start, tmpEnd);
 			}
 		}

src/box2dLight/SmoothConeLight.java

@@ -33,7 +33,10 @@ protected void updateMesh() {
 			// shoot check each ray
 			for (int i = 0; i < currentRayNum; i++) {
 				// rayCast is not async, so we can do that
-				rayHandler.world.rayCast(perfectRay, start, current = rays[i]);
+				if (!rays[i].equals(start)) {
+					current = rays[i];
+					rayHandler.world.rayCast(perfectRay, start, current);
+				}
 			}
 			if (currentRayNum >= baseRayNum) {
 				// rotate all the rays so we always can be sorter properly

src/box2dLight/SmoothLineLight.java

@@ -547,7 +547,9 @@ private void updateMesh () {
 			for (int i = 0; i < currentRayNum; i++) {
 				currentId = i;
 				LineRay ray = lineRays[i];
-				rayHandler.world.rayCast(rayCB, ray.start, ray.end);
+				if (!ray.start.equals(ray.end)) {
+					rayHandler.world.rayCast(rayCB, ray.start, ray.end);
+				}
 			}
 
 			// we need to sort if stuff was added to set the mesh properly

src/box2dLight/SmoothPointLight.java

@@ -25,7 +25,10 @@ protected void updateMesh() {
 			// shoot check each ray
 			for (int i = 0; i < currentRayNum; i++) {
 				// rayCast is not async, so we can do that
-				rayHandler.world.rayCast(perfectRay, start, current = rays[i]);
+				if (!rays[i].equals(start)) {
+					current = rays[i];
+					rayHandler.world.rayCast(perfectRay, start, current);
+				}
 			}
 
 			// we need to sort if stuff was added to set the mesh properly

src/box2dLight/SmoothPositionalLight.java

@@ -9,6 +9,7 @@
 import com.badlogic.gdx.math.Vector2;
 import com.badlogic.gdx.physics.box2d.*;
 import com.badlogic.gdx.utils.Array;
+import com.badlogic.gdx.utils.NumberUtils;
 
 import java.util.Comparator;
 
@@ -450,6 +451,19 @@ public void reset () {
 			fraction = 1;
 		}
 
+		@Override
+		public boolean equals (Object obj) {
+			// no class checking here
+
+			if (this == obj) return true;
+			if (obj == null) return false;
+
+			Vector2 other = (Vector2)obj;
+			if (NumberUtils.floatToIntBits(x) != NumberUtils.floatToIntBits(other.x)) return false;
+			if (NumberUtils.floatToIntBits(y) != NumberUtils.floatToIntBits(other.y)) return false;
+			return true;
+		}
+
 		@Override public String toString () {
 			return String.format("Ray([%.2f, %.2f] a=%.2f, f=%.2f)", x, y, angle * MathUtils.radDeg, fraction);
 		}