Occasional PermissionError when dict-writing to csv

Question

I've written a tkinter app in Python 3.7, which extracts from main CSV, pre-filtered by user, information into smaller reports. My issue is that while writing filtered data from main CSV into report I occasionally get a PermissionError:

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\mdiakuly\AppData\Roaming\Python\Python37\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "D:/PycharmProjects/report_extractor_hil_sil/report_extractor.py", line 286, in report_generation_prep
    self.report_generation(names_list, relevant_params, specific_value, extracted_file)
  File "D:/PycharmProjects/report_extractor_hil_sil/report_extractor.py", line 344, in report_generation
    processing_data(rd,column)
  File "D:/PycharmProjects/report_extractor_hil_sil/report_extractor.py", line 336, in processing_data
    writing_new_report(gathering_row)
  File "D:/PycharmProjects/report_extractor_hil_sil/report_extractor.py", line 299, in writing_new_report
    with open(extracted_file, 'a+', newline='') as write_in:
PermissionError: [Errno 13] Permission denied: 'C:/Users/myusername/Desktop/reporter/Partial_report_14_10_2021T15-13-12.csv'

Once it has extracted only one row and through an error, another time it did whole extraction with no error, and few other times it extracted thousands of rows and through an error. CSV file which is being written into was never opened during info extraction.

Has anyone faced the same issue or maybe has an idea how to fix it?

    def writing_new_report(complete_row):

        with open(extracted_file, 'a+', newline='') as write_in:
            wt = csv.DictWriter(write_in, delimiter=';', fieldnames=relevant_params)
            if self.debug:
                print(complete_row)
            wt.writerow(complete_row)

    def processing_data(r_d,column='def'):

        for idx, row in enumerate(r_d): #looping through major csv
            self.progress.update()
            if self.debug:
                print(f'{idx:}',end=' / ')
            gathering_row = {}
            if column != 'def':
                if row[column] not in names_list:
                    continue
                else:
                    names_list.remove(row[column])
                    pass
            else:
                pass

            for param, value in zip(relevant_params,specific_value):
                self.progress.update()
                if self.debug:
                    print(f'{row[param]:}',end=' / ')
                gathering_row[param] = row[param]
                if value == '---- All ----':
                    pass
                elif value != row[param]:
                    if self.debug:
                        print(f'{row[param]:} - Skipped')
                    break

                if param == relevant_params[len(relevant_params)-1]:
                    if self.debug:
                        print(f'{row[param]:} - Written')
                    writing_new_report(gathering_row)