About It works when render=True is running, but it will report an error when render is set to False.

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Bug Description

I found out flow-project works when render=True is running, but it will report an error when render is set to False.
A clear and concise description of the bug and what you expected to happen.

Bug Reproduce

File in which the bug occurred: file.py

The exact command that you did run that caused the bug:
command

Output Log

Full error output log:

error log

Screenshots

I felt like the start of one training after one training was done and the rebuild vehicle wasn't cleaned up, not knowing if I was right or not, but from the error reporting it was.
Screenshots:

Versions

• OS: ? (For example, RedHat, macOS Mojave, ...]

• Flow version: ? (run python -c "import flow; print(flow.__version__)")

• Flow commit number: ? (run git log and copy the commit number)