Hi, please help

1. Error after create new project
2. The capture in browser : 20220613a.jpg

3. The capture in error log :
2022-06-13 05:47:44.303 ** ERROR ** [V9.5.4] ERROR **
2022-06-13 05:47:44.318 ** ERROR ** [V9.5.4] on file 'C:xampphtdocsprojeqtormodelProjectPlanningElementMain.php' at line (287)
2022-06-13 05:47:44.331 ** ERROR ***** [V9.5.4] cause = A non-numeric value encountered

I search for the non-numeric value but don't know what field.
Field that I put: name, such as test1 

Please help, thank you