NSError** issue back propagate in multi function call

Facing an issue in back propagation of error in multi functional call.

For example,

NSError *error = nil;
EMSPlanFolder *planner = [[EMSPlanFolder sharedPlanBuilder] buildPlanFromParsePlan:plan withError:&error];
if (error) {
   //error
}

Next, it goes to function:

- (EMSPlanFolder*)buildPlanFromParsePlan:(EMParsedPlan*)parsedPlan withError:(NSError *__autoreleasing*)err
{
 ....
 ....
 [self deserializePlan:parsedPlan forPlan:newPlanFolder allowingNoEndDate:NO withError:err];
  if(err && *err) {
   [newPlanFolder.managedObjectContext performBlockAndWait:^{
 [EMSPlanFolder deletePlan:newPlanFolder];
    }];
  return nil;
  }
 return newPlanFolder;
}

Next, it goes to:

   - (void)deserializePlan:(NSArray*)planElements forPlan:(LMSPlanFolder*)planFolder allowingNoEndDate:(BOOL)allowNoEndDate withError:(NSError *__autoreleasing*)err {
     ....
     ....
     if(err) {
      *err = [NSError errorWithDomain:@"Application" code:-1 userInfo:@{ NSLocalizedDescriptionKey:[NSString stringWithFormat:@"Plan was not found."]}];
     }
     return;
    }

Problem is, it leads to crash when it back propagates to first code snippet. Any suggestions on it