diff --git a/src/main/java/ai/nets/samj/gui/MainGUI.java b/src/main/java/ai/nets/samj/gui/MainGUI.java
index 28b0d0c..5d2e0ea 100644
--- a/src/main/java/ai/nets/samj/gui/MainGUI.java
+++ b/src/main/java/ai/nets/samj/gui/MainGUI.java
@@ -436,7 +436,9 @@ private void toggleDrawer() {
     }
     
     private < T extends RealType< T > & NativeType< T > > void batchSAMize() throws IOException, RuntimeException, InterruptedException {
-    	RandomAccessibleInterval<T> rai = this.consumer.getFocusedImageAsRai();
+    	RandomAccessibleInterval<T> rai = null;
+    	if (this.consumer.getFocusedImage() != this.cmbImages.getSelectedObject())
+    		rai = this.consumer.getFocusedImageAsRai();
     	List<int[]> pointPrompts = this.consumer.getPointRoisOnFocusImage();
     	List<Rectangle> rectPrompts = this.consumer.getRectRoisOnFocusImage();
     	if (pointPrompts.size() == 0 && rectPrompts.size() == 0 && !(rai.getType() instanceof IntegerType)){
diff --git a/src/main/java/ai/nets/samj/models/AbstractSamJ.java b/src/main/java/ai/nets/samj/models/AbstractSamJ.java
index 64b1abf..71c4749 100644
--- a/src/main/java/ai/nets/samj/models/AbstractSamJ.java
+++ b/src/main/java/ai/nets/samj/models/AbstractSamJ.java
@@ -167,8 +167,7 @@ public interface DebugTextPrinter { void printText(String text); }
 	
 	protected abstract void cellSAM(List<int[]> grid, boolean returnAll);
 	
-	protected abstract void
-	processPromptsBatchWithSAM(int npoints, int nrects, SharedMemoryArray shmArr, boolean returnAll);
+	protected abstract void processPromptsBatchWithSAM(SharedMemoryArray shmArr, boolean returnAll);
 	
 	protected abstract void processPointsWithSAM(int nPoints, int nNegPoints, boolean returnAll);
 	
@@ -436,13 +435,14 @@ List<Mask> processBatchOfPrompts(List<int[]> pointsList, List<Rectangle> rects,
 				rectPrompts = rects.stream().map(rr -> new int[] {rr.x, rr.y, rr.x + rr.width, rr.y + rr.height})
 											.collect(Collectors.toList());
 			inputs.put("rect_prompts", rectPrompts);
-			processPromptsBatchWithSAM(pointsList.size(), rects.size(), maskShma, returnAll);
+			processPromptsBatchWithSAM(maskShma, returnAll);
 			printScript(script, "Batch of prompts inference");
-			List<Mask> polys = processAndRetrieveContours(null);
+			List<Mask> polys = processAndRetrieveContours(inputs);
 			recalculatePolys(polys, encodeCoords);
 			return polys;
 		} catch (IOException | RuntimeException | InterruptedException ex) {
-			maskShma.close();
+			if (maskShma != null)
+				maskShma.close();
 			throw ex;
 		}
 	}
diff --git a/src/main/java/ai/nets/samj/models/EfficientSamJ.java b/src/main/java/ai/nets/samj/models/EfficientSamJ.java
index 110b2c3..c820e42 100644
--- a/src/main/java/ai/nets/samj/models/EfficientSamJ.java
+++ b/src/main/java/ai/nets/samj/models/EfficientSamJ.java
@@ -19,7 +19,6 @@
  */
 package ai.nets.samj.models;
 
-import java.awt.Rectangle;
 import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
@@ -387,7 +386,7 @@ public String deleteEncodingScript(String encodingName) {
 	}
 
 	@Override
-	protected void processPromptsBatchWithSAM(int npoints, int nrects, SharedMemoryArray shmArr,
+	protected void processPromptsBatchWithSAM(SharedMemoryArray shmArr,
 			boolean returnAll) {
 		String code = "";
 		code += "shm_mask = shared_memory.SharedMemory(name='" + shmArr.getNameForPython() + "')" + System.lineSeparator();
diff --git a/src/main/java/ai/nets/samj/models/EfficientViTSamJ.java b/src/main/java/ai/nets/samj/models/EfficientViTSamJ.java
index bf30b86..09862cd 100644
--- a/src/main/java/ai/nets/samj/models/EfficientViTSamJ.java
+++ b/src/main/java/ai/nets/samj/models/EfficientViTSamJ.java
@@ -27,7 +27,6 @@
 import ai.nets.samj.install.EfficientViTSamEnvManager;
 import ai.nets.samj.install.SamEnvManagerAbstract;
 
-import java.awt.Rectangle;
 import java.io.File;
 import java.io.IOException;
 
@@ -462,7 +461,7 @@ public String deleteEncodingScript(String encodingName) {
 	}
 
 	@Override
-	protected void processPromptsBatchWithSAM(int npoints, int nrects, SharedMemoryArray shmArr,
+	protected void processPromptsBatchWithSAM(SharedMemoryArray shmArr,
 			boolean returnAll) {
 		String code = "";
 		code += "shm_mask = shared_memory.SharedMemory(name='" + shmArr.getNameForPython() + "')" + System.lineSeparator();
diff --git a/src/main/java/ai/nets/samj/models/Sam2.java b/src/main/java/ai/nets/samj/models/Sam2.java
index d343deb..dcc1d8e 100644
--- a/src/main/java/ai/nets/samj/models/Sam2.java
+++ b/src/main/java/ai/nets/samj/models/Sam2.java
@@ -446,19 +446,23 @@ public String deleteEncodingScript(String encodingName) {
 	}
 
 	@Override
-	protected void processPromptsBatchWithSAM(int npoints, int nrects, SharedMemoryArray shmArr, boolean returnAll) {
-		String code = "";
-		code += "shm_mask = shared_memory.SharedMemory(name='" + shmArr.getNameForPython() + "')" + System.lineSeparator();
-		code += "mask = np.frombuffer(buffer=shm_mask.buf, dtype='" + shmArr.getOriginalDataType() + "').reshape([";
-		for (long l : shmArr.getOriginalShape()) 
-			code += l + ",";
-		code += "])" + System.lineSeparator();
+	protected void processPromptsBatchWithSAM(SharedMemoryArray shmArr, boolean returnAll) {
+		String code = ""
+				+ "num_features = 0" + System.lineSeparator();
+		if (shmArr != null) {
+			code += ""
+					+ "shm_mask = shared_memory.SharedMemory(name='" + shmArr.getNameForPython() + "')" + System.lineSeparator()
+					+ "mask_batch = np.frombuffer(buffer=shm_mask.buf, dtype='" + shmArr.getOriginalDataType() + "').reshape([";
+			for (long l : shmArr.getOriginalShape()) 
+				code += l + ",";
+			code += "])" + System.lineSeparator();
+			code += "labeled_array, num_features = label(mask_batch)" + System.lineSeparator();
+		}
 		code += ""
 				+ "point_prompts = []" + System.lineSeparator()
 				+ "point_labels = []" + System.lineSeparator()
 				+ "mask_prompts = []" + System.lineSeparator()
 				+ "mask_labels = []" + System.lineSeparator()
-				+ "labeled_array, num_features = label(mask)" + System.lineSeparator()
 				+ "contours_x = []" + System.lineSeparator()
 				+ "contours_y = []" + System.lineSeparator()
 				+ "rle_masks = []" + System.lineSeparator()
@@ -483,7 +487,7 @@ protected void processPromptsBatchWithSAM(int npoints, int nrects, SharedMemoryA
 				+ "  contours_y += c_Y" + System.lineSeparator()
 				+ "  rle_masks += r_m" + System.lineSeparator()
 				+ "" + System.lineSeparator()
-				+ "for p_prompt in range(" + npoints + "):" + System.lineSeparator()
+				+ "for p_prompt in point_prompts:" + System.lineSeparator()
 				+ "  mask, _, _ = predictor.predict(" + System.lineSeparator()
 				+ "    point_coords=np.array(p_prompt).reshape(1, 2)," + System.lineSeparator()
 				+ "    point_labels=np.array([1])," + System.lineSeparator()
@@ -496,7 +500,7 @@ protected void processPromptsBatchWithSAM(int npoints, int nrects, SharedMemoryA
 				+ "  rle_masks += r_m" + System.lineSeparator()
 				+ "" + System.lineSeparator()
 				+ "" + System.lineSeparator()
-				+ "for rect_prompt in range(" + nrects + "):" + System.lineSeparator()
+				+ "for rect_prompt in rect_prompts:" + System.lineSeparator()
 				+ "  input_box = np.array([[input_box[0], input_box[1]], [input_box[2], input_box[3]]])" + System.lineSeparator()
 				+ "  mask, _, _ = predictor.predict(" + System.lineSeparator()
 				+ "    point_coords=None," + System.lineSeparator()
@@ -519,8 +523,10 @@ protected void processPromptsBatchWithSAM(int npoints, int nrects, SharedMemoryA
 				+ "task.outputs['contours_y'] = contours_y" + System.lineSeparator()
 				+ "task.outputs['rle'] = rle_masks" + System.lineSeparator();
 		code += "mask = 0" + System.lineSeparator();
-		code += "shm_mask.close()" + System.lineSeparator();
-		code += "shm_mask.unlink()" + System.lineSeparator();
+		if (shmArr != null) {
+			code += "shm_mask.close()" + System.lineSeparator();
+			code += "shm_mask.unlink()" + System.lineSeparator();
+		}
 		this.script = code;
 	}
 }