I found this error in the error log, but i don't know how to solve it.
SSIWebVersion= 8_2_4 params= hid_A4_r88_other=>1,100,, hid_noneabove_A5=>99, hid_backup=>2830IC,4521,905029494,26,1, A4_r76_other=>, A4_r86_other=>, A5_r98_other=>, hid_row_list_A5=>5,2,4,1,3,6,9,8,7,10,11,13,15,12,14,16,17,19,20,18,21,96,97,98,99, hid_previous=>0, hid_studyname=>2830IC, A4_r88_other=>, hid_A4_r87_other=>1,100,, hid_q_A4=>A4, A4_r96_other=>, A4_r78_other=>, hid_pagenum=>26, A4_r3_c1=>1, A4_r2_c1=>1, A4_r77_other=>, hid_A4_r97_other=>1,100,, A5_r96_other=>, A5_r97_other=>, A4_r4_c1=>1, A5_r5_c3=>1, hid_A4_r76_other=>1,100,, hid_col_list_A5=>1,2,3, A4_r87_other=>, hid_A4_r86_other=>1,100,, hid_prev_A5.11=>177,A5.11,26,8bd3685c61308d0e354c4437a512b7f1, A4_r98_other=>, A5_r5_c1=>1, hid_A5_r97_other=>1,100,, A4_r1_c1=>1, hid_A4_r96_other=>1,100,, hid_respnum=>4521, A5_r5_c2=>1, hid_A5_r98_other=>1,100,, hid_checksum=>905029494, hid_page_vars=>hid_loops, hid_pagetime=>1617799100, A4_r99_c3=>1, A4_r99_c2=>1, A4_r5_c1=>1, hid_A4_r98_other=>1,100,, hid_q_A5=>A5, hid_A5_r96_other=>1,100,, hid_A4_r77_other=>1,100,, hid_noneabove_A4=>99, hid_row_list_A4=>10,11,86,87,88,15,14,16,17,13,18,5,4,3,1,2,76,77,78,7,9,8,96,97,98,99, hid_A4_r78_other=>1,100,, hid_col_list_A4=>1,2,3, hid_destination=>A4, hid_loops=>A4Loop,1, A4_r97_other=>, hid_prev_A4.11=>176,A4.11,26,9a2be446532c625279e7ed8dd6a8b2a1, hid_javascript=>1, IP= 123.202.17.154 , client= Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36