error on reports : test session summary

when i request a test session summary report, i do not see any button, but i have a warning icon :

 

here is the logged anomaly :

2023-10-10 15:26:27.626 ***** ERROR ***** [V10.4.5] EXCEPTION *****
2023-10-10 15:26:27.636 ***** ERROR ***** [V10.4.5] on file 'E:\IISWWW\constellation\tool\html.php' at line (474)
2023-10-10 15:26:27.645 ***** ERROR ***** [V10.4.5] cause = get_class(): Argument #1 ($object) must be of type object, null given
2023-10-10 15:26:27.662 ***** ERROR ***** [V10.4.5] => #0 E:\IISWWW\constellation\view\reportsParameters.php (615) -> htmlDrawOptionForReference()
2023-10-10 15:27:15.032 ***** ERROR ***** [V10.4.5] EXCEPTION *****
2023-10-10 15:27:15.041 ***** ERROR ***** [V10.4.5] on file 'E:\IISWWW\constellation\tool\html.php' at line (474)
2023-10-10 15:27:15.051 ***** ERROR ***** [V10.4.5] cause = get_class(): Argument #1 ($object) must be of type object, null given
2023-10-10 15:27:15.059 ***** ERROR ***** [V10.4.5] => #0 E:\IISWWW\constellation\view\reportsParameters.php (615) -> htmlDrawOptionForReference()
2023-10-10 15:28:46.921 ***** ERROR ***** [V10.4.5] ERROR *****
2023-10-10 15:28:46.940 ***** ERROR ***** [V10.4.5] on file 'E:\IISWWW\constellation\view\refreshLastNews.php' at line (70)
2023-10-10 15:28:46.954 ***** ERROR ***** [V10.4.5] cause = foreach() argument must be of type array|object, null given