bugfix

Author: thsa

src/main/java/org/openmolecules/fx/viewer3d/V3DMoleculeCropper.java

@@ -46,10 +46,6 @@ public V3DMoleculeCropper(V3DMolecule fxmol, double distance, Point3D[] refPoint
 	}
 
 	public void crop() {
-		int ribbonMode = mFXMol.getRibbonMode();
-		if (ribbonMode != Ribbons.MODE_NONE)
-			mFXMol.setRibbonMode(Ribbons.MODE_NONE);
-
 		StereoMolecule mol = mFXMol.getMolecule();
 		boolean[] deleteAtom = new boolean[mol.getAllAtoms()];
 		int count = 0;
@@ -65,10 +61,16 @@ else if (beyond == 0) {
 			}
 		}
 
-		if (count != 0)
+		if (count != 0) {
+			int ribbonMode = mFXMol.getRibbonMode();
+			if (ribbonMode != Ribbons.MODE_NONE)
+				mFXMol.setRibbonMode(Ribbons.MODE_NONE);
+
 			mFXMol.deleteAtoms(deleteAtom);
 
-		mFXMol.setRibbonMode(ribbonMode);
+			if (ribbonMode != Ribbons.MODE_NONE)
+				mFXMol.setRibbonMode(ribbonMode);
+		}
 	}
 
 	@Override

src/main/java/org/openmolecules/fx/viewer3d/nodes/Ribbons.java

@@ -94,6 +94,7 @@ private int[][][] readBackbone() {
             return null;
 
         Molecule3D mol = (Molecule3D)mMol;
+        mol.ensureHelperArrays(Molecule.cHelperNeighbours);
 
         ArrayList<int[]> atomsList = new ArrayList<>();
         int[] atoms = null;