Program: 25993
Project: 25993
Buggy source:
@Override public Field deserialize(JsonElement element,Type type,JsonDeserializationContext gsonContext) throws JsonParseException {
  JsonObject jsonObject=element != null ? element.getAsJsonObject() : null;
  JsonElement fieldType=jsonObject != null ? jsonObject.get("String_Node_Str") : null;
  String fieldTypeName=fieldType != null ? fieldType.getAsString() : null;
  Field.Type typeEnum=Field.Type.valueOf(fieldTypeName);
switch (typeEnum) {
case app:
    return gsonContext.deserialize(element,ApplicationReference.class);
case calculation:
  return gsonContext.deserialize(element,CalculationField.class);
case category:
return gsonContext.deserialize(element,Category.class);
case contact:
return gsonContext.deserialize(element,ContactField.class);
case date:
return gsonContext.deserialize(element,DateField.class);
case duration:
return gsonContext.deserialize(element,DurationField.class);
case embed:
return gsonContext.deserialize(element,EmbedField.class);
case image:
return gsonContext.deserialize(element,ImageField.class);
case location:
return gsonContext.deserialize(element,LocationField.class);
case money:
return gsonContext.deserialize(element,MoneyField.class);
case number:
return gsonContext.deserialize(element,NumberField.class);
case progress:
return gsonContext.deserialize(element,ProgressField.class);
case text:
return gsonContext.deserialize(element,Text.class);
case title:
return gsonContext.deserialize(element,TitleField.class);
default :
return gsonContext.deserialize(element,Text.class);
}
}

Fixed version (ground truth):
@Override public Field deserialize(JsonElement element,Type type,JsonDeserializationContext gsonContext) throws JsonParseException {
  JsonObject jsonObject=element != null && !element.isJsonNull() ? element.getAsJsonObject() : null;
  JsonElement fieldType=jsonObject != null && !jsonObject.isJsonNull() ? jsonObject.get("String_Node_Str") : null;
  String fieldTypeName=fieldType != null && !fieldType.isJsonNull() ? fieldType.getAsString() : Field.Type.undefined.name();
  Field.Type typeEnum;
  try {
    typeEnum=Field.Type.valueOf(fieldTypeName);
  }
 catch (  IllegalArgumentException e) {
    typeEnum=Field.Type.undefined;
  }
switch (typeEnum) {
case app:
    return gsonContext.deserialize(element,ApplicationReference.class);
case calculation:
  return gsonContext.deserialize(element,CalculationField.class);
case category:
return gsonContext.deserialize(element,Category.class);
case contact:
return gsonContext.deserialize(element,ContactField.class);
case date:
return gsonContext.deserialize(element,DateField.class);
case duration:
return gsonContext.deserialize(element,DurationField.class);
case embed:
return gsonContext.deserialize(element,EmbedField.class);
case image:
return gsonContext.deserialize(element,ImageField.class);
case location:
return gsonContext.deserialize(element,LocationField.class);
case money:
return gsonContext.deserialize(element,MoneyField.class);
case number:
return gsonContext.deserialize(element,NumberField.class);
case progress:
return gsonContext.deserialize(element,ProgressField.class);
case text:
return gsonContext.deserialize(element,TextField.class);
case title:
return gsonContext.deserialize(element,TitleField.class);
default :
JsonObject empty=new JsonObject();
empty.addProperty("String_Node_Str",Field.Type.undefined.name());
return gsonContext.deserialize(empty,EmptyField.class);
}
}