Update app.py

app.py

@@ -161,8 +161,11 @@ with tab2:
                     if landmarks is not None:
                         fig = plot_hand_landmarks(landmarks, f"Hand Landmarks for {alphabet}")
                         st.pyplot(fig)
+                    else:
+                        st.error(f"Failed to process image for {alphabet}")
                 else:
                     st.error(f"Image not found for {alphabet}")
 
-# Release MediaPipe resources
-hands.close()
+# Don't close hands here, as it might be None
+if hands is not None:
+    hands.close()