reaction can be null

converter-sbml/src/main/java/lcsb/mapviewer/converter/model/sbml/reaction/SBOTermReactionType.java

@@ -52,6 +52,10 @@ public enum SBOTermReactionType {
   }
 
   public static Class<? extends Reaction> getTypeSBOTerm(org.sbml.jsbml.Reaction reaction) {
+    if (reaction == null) {
+      return StateTransitionReaction.class;
+
+    }
     String sboTerm = reaction.getSBOTermID();
     if (sboTerm == null || sboTerm.isEmpty()) {
       return StateTransitionReaction.class;