do not process vars if there were errors in the method

src/org/jetbrains/java/decompiler/main/rels/ClassWrapper.java

@@ -158,6 +158,7 @@ public class ClassWrapper {
 
       methods.addWithKey(methodWrapper, InterpreterUtil.makeUniqueKey(mt.getName(), mt.getDescriptor()));
 
+      if (!isError) {
         // rename vars so that no one has the same name as a field
         varProc.refreshVarNames(new VarNamesCollector(setFieldNames));
 
@@ -185,6 +186,7 @@ public class ClassWrapper {
             });
           }
         }
+      }
 
       DecompilerContext.getLogger().endMethod();
     }