Function seems to runs properly without an error but the function has not been executed

Function seems to runs properly without an error but the function has not been executed

Hello, 

I do have an issue with a complex script. The script used to work without any problems but for some reason the function stopped working. 

The console says "Function successfully executed" but the function did not run (or there was an error but the error won't be displayed in the console). 

I already looked in the failure list (Zoho CRM / Settings / Developer Space / Functions) but there was no error listed. 

Is there a better way to debug a script in Zoho CRM? I am bit confused why the script won't work anymore and I got no error. 

Thanks for help, 
M.