Get "Internal Server Error Undefined index: handle" Hi I was trying to save the matrix field and got the error:
"Internal Server Error

Undefined index: handle"

I checked out all fields' handles and they are all in place.

Is there any reason causing the error?


Thank you!
This ended up being an environmental issue with semi-largish Matrix fields.

The three most common culprits are your php.ini file's max_input_vars, max_input_nesting_level and post_max_size would would need to be adjusted upwards, but other settings might come into play depending on your environment an Matrix configuration.

Also, if your server is running anything like mod_security or Suhosin, they have additional settings that might need to be adjusted higher that could affect this.