Check for a null major isotope, which happens with R-groups

Signed-off-by: Rajarshi Guha <rajarshi.guha@gmail.com>
cdk · Oct 5, 2010 · 6fdb866 · 6fdb866
1 parent 8d72fe4
commit 6fdb866
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/main/org/openscience/cdk/smiles/SmilesGenerator.java b/src/main/org/openscience/cdk/smiles/SmilesGenerator.java
@@ -1825,7 +1825,7 @@ private String generateMassString(IAtom a)
         }
 
         IIsotope majorIsotope = isotopeFactory.getMajorIsotope(a.getSymbol());
-		if (majorIsotope.getMassNumber() == a.getMassNumber())
+		if (majorIsotope == null || majorIsotope.getMassNumber() == a.getMassNumber())
 		{
 			return "";
 		} else if (a.getMassNumber() == null)